Award Type [Axis] SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES [Abstract] OTHER PAYABLE AND ACCRUED EXPENSES Accounts Payable and Accrued Liabilities Disclosure [Text Block] Accounts payable Accounts Payable and Other Accrued Liabilities Accounts payable Accounts payable Accounts Payable, Related Parties, Current Accounts Receivable [Abstract] Accounts Receivable, after Allowance for Credit Loss [Abstract] Accounts receivable Accounts Receivable, before Allowance for Credit Loss, Current Accounts receivable, less allowance for doubtful accounts of $0 as of December 31, 2021 and December 31, 2020 (note 4) Total Accounts receivable Accounts Receivable [Abstract] Accounts Receivable, after Allowance for Credit Loss, Current [Abstract] Accrued professional fees Accrued commissions Income taxes payable (note 21) Income taxes payable Accrued Income Taxes, Current Accumulated Other Comprehensive Income (Loss) [Table] Capitalized interest charges related to property Accumulated Other Comprehensive Income (Loss) [Line Items] Accumulated other comprehensive income Accumulated Other Comprehensive Income (Loss) [Member] AOCI Attributable to Parent [Member] Less: Total accumulated depreciation Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Additional paid in capital Additional Paid in Capital Additional Paid-In Capital [Member] Amortization Stock-based compensation APIC, Share-based Payment Arrangement, Increase for Cost Recognition Adjustments to reconcile net income from operations to net cash used in operating activities Issuance of warrants (note 15) Stock-based compensation expense Accounts receivable, allowance for doubtful accounts Less: allowance for doubtful accounts Allowance for doubtful accounts Amounts restricted included paid-in capital and statutory reserve funds Anti-dilutive securities excluded from earnings per share (in shares) Total assets Assets Assets Assets Assets [Abstract] Total current assets Assets, Current Current assets: Current assets: Current assets [Abstract] Balance Sheet Location [Domain] Balance Sheet Location [Axis] DESCRIPTION OF BUSINESS Business Description and Basis of Presentation [Text Block] Net increase (decrease) in cash and cash equivalents Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect Cash, cash equivalents and restricted cash at beginning of period Cash, cash equivalents and restricted cash at end of period Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents Cash and Cash Equivalents Cash and Cash Equivalents, Policy [Policy Text Block] Cash paid for amounts included in the measurement of lease liabilities [Abstract] Cash Flow, Operating Activities, Lessee [Abstract] Cash and cash equivalents Restricted Cash Cash and Cash Equivalents, Restricted Cash and Cash Equivalents, Policy [Policy Text Block] Class of Warrant or Right [Axis] Class of Stock [Line Items] Class of Stock [Domain] Class of Warrant or Right [Domain] Class of Stock [Abstract] COMMITMENTS AND CONTINGENCIES [Abstract] COMMITMENTS AND CONTINGENCIES Commitments and Contingencies Disclosure [Text Block] Commitments and contingencies (note 23) Class B Common Stock [Member] Common Stock Class B [Member] Common Class B [Member] Class A Common Stock [Member] Common Stock Class A [Member] Common Class A [Member] Common Stock [Member] Common Stock [Member] Common Stock [Member] Common stock, shares issued (in shares) Common stock, shares issued (in shares) Common Stock, Shares, Issued Common stock, par value (in dollars per share) Common stock, par value (in dollars per share) Common Stock, Par or Stated Value Per Share Common stock Common Stock, Value, Issued Common stock, shares authorized (in shares) Common stock, shares authorized (in shares) Common Stock, Shares Authorized Common stock, shares outstanding (in shares) Common stock, shares outstanding (in shares) Components of Deferred Tax Assets [Abstract] Income Tax Benefit (Expense) [Abstract] Comprehensive Income Attributable to the Company Comprehensive Income, Policy [Policy Text Block] Comprehensive Income Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest Comprehensive income: Comprehensive Income (Loss) Attributable to the Company [Abstract] Comprehensive income attributable to the Company Comprehensive income attributable to ACM Research, Inc. Comprehensive Income (Loss), Net of Tax, Attributable to Parent Software [Member] Concentration Risk [Table] Concentration Risk Type [Domain] Concentration of credit risk Concentration Risk Benchmark [Domain] Concentration Risk Type [Axis] Concentration Risk [Line Items] Concentration Risk Benchmark [Axis] PARENT COMPANY ONLY CONDENSED FINANCIAL INFORMATION Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Table] Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] Construction in progress Advances from customers Contract with Customer, Liability, Current Commitments Convertible shares in to Class A common stock (in shares) Cost of revenue Cost of revenue Cost of Revenue Cost of Goods and Service [Policy Text Block] Cost of Revenue [Member] Foreign Current Foreign Tax Expense (Benefit) U.S. state Current State and Local Tax Expense (Benefit) U.S. federal Current Federal Tax Expense (Benefit) Total current tax expense Current Income Tax Expense (Benefit) Current [Abstract] Current Income Tax Expense (Benefit), Continuing Operations [Abstract] Customer Concentration Risk [Member] Disaggregation of Revenue [Line Items] Disaggregation of Revenue [Table] Disaggregated Revenue Information Unrealized gain on trading securities Debt Securities, Trading, Unrealized Gain SHORT-TERM BORROWINGS [Abstract] Short-Term and Long-term Borrowings [Abstract] Debt, Long-term and Short-term, Combined Amount [Abstract] Debt Instrument [Axis] Promissory note principal amount Debt Instrument, Face Amount Schedule of Long-term Debt Instruments [Table] Debt Instrument [Line Items] Borrowing Costs Debt, Policy [Policy Text Block] Interest rate on promissory note Debt Instrument, Interest Rate, Stated Percentage Promissory note maturity date Line of credit due date Last installment due date Debt Instrument, Name [Domain] Deferred tax liability Deferred tax liability (note 21) Deferred tax assets (note 21) Deferred tax assets Deferred revenue Total deferred tax benefit Deferred Federal, State and Local, Tax Expense (Benefit) Deferred Tax Liabilities [Abstract] Property and equipment (U.S.) Deferred [Abstract] U.S. federal Deferred Federal Income Tax Expense (Benefit) Deferred income taxes Foreign Deferred Foreign Income Tax Expense (Benefit) U.S. state Deferred State and Local Income Tax Expense (Benefit) Net operating loss carry forwards (U.S.) and credit Deferred Tax Assets [Abstract] Total deferred tax assets Deferred Tax Assets, Net of Valuation Allowance Deferred tax assets, net Deferred Tax Assets, Net Total gross deferred tax assets Deferred Tax Assets, Gross Deferred revenue (offshore) Research credit carry-forwards Stock-based compensation (U.S.) Net operating loss carry forwards (offshore) Total deferred tax liabilities Deferred Tax Liabilities, Net Reserves and other (offshore) Accruals (U.S.) Less: valuation allowance Deferred Tax Assets, Valuation Allowance Fixed assets Deferred Tax Liabilities, Other Finite-Lived Assets Deferred revenue (offshore) Deferred Tax Liabilities, Tax Deferred Income Unrealized gain on trading securities Deferred Tax Liabilities, Unrealized Gains on Trading Securities Depreciation expense Depreciation and amortization Less: Dilutive effect arising from share-based awards by ACM Shanghai Dilutive Securities, Effect on Basic Earnings Per Share, Dilutive Convertible Securities STOCK-BASED COMPENSATION [Abstract] STOCK-BASED COMPENSATION Share-based Payment Arrangement [Text Block] U.S. Federal [Member] Domestic Tax Authority [Member] Due from intercompany Investment due amount Net income attributable to ACM Research, Inc. per common share (note 2): Net income per common share [Abstract] Earnings Per Share, Basic and Diluted [Abstract] Basic and Diluted Net Income per Common Share Earnings Per Share, Policy [Policy Text Block] Basic (in dollars per share) Basic (in dollars per share) Earnings Per Share, Basic Basic and Diluted Net Income (Loss) per Common Share [Abstract] Earnings Per Share [Abstract] Diluted (in dollars per share) Diluted (in dollars per share) Earnings Per Share, Diluted Effect of exchange rate changes on cash, cash equivalents and restricted cash Effect of exchange rate changes on cash and cash equivalents Foreign Research Expense Effective Income Tax Rate Reconciliation, Nondeductible Expense, Research and Development, Percent Stock Compensation Foreign rate differential Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Percent Other permanent difference Change in valuation allowance Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Percent Income tax provision at statutory rate Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent Foreign income taxed in US Effective Tax Rate Reconciliation [Abstract] Effective Income Tax Rate Reconciliation, Percent [Abstract] Total income tax expense (benefit) Effective Income Tax Rate Reconciliation, Percent Weighted-average period over which unrecognized compensation is expected to be recognized Employee Share Option [Member] Employee Stock Purchase Plan [Member] Share-based Payment Arrangement, Option [Member] Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] Accrued payroll Unrecognized employee stock-based compensation expense Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount Manufacturing Equipment [Member] Equipment [Member] Equity Component [Domain] COMMON STOCK [Abstract] Purchase price Percentage of ordinary shares issued Investment - equity method Equity Method Investments Fair Value of Financial Instruments Fair Value of Financial Instruments, Policy [Policy Text Block] Financial liability carried at fair value Financial Liabilities Fair Value Disclosure Intangible Assets, Net [Abstract] Intangible assets amortization period Finite-Lived Intangible Assets, Major Class Name [Domain] Finite-Lived Intangible Assets [Line Items] Finite-Lived Intangible Assets by Major Class [Axis] Intangible assets, net Finite-Lived Intangible Assets, Net Exchange rate Foreign Currency Exchange Rate, Translation PRC [Member] Foreign Tax Authority [Member] Furniture and Fixtures [Member] Loss on disposals of property, plant and equipment Gain (Loss) on Disposition of Property Plant Equipment General and administrative General and administrative expenses General and Administrative Expense [Member] Gross profit Gross Profit Valuation of Long-Lived Assets Income before income taxes Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Income Statement Location [Domain] INCOME TAXES [Abstract] Income Statement Location [Axis] Income Tax Authority [Axis] Equity income in net income of affiliates Equity income in net income of affiliates Equity in earnings of unconsolidated subsidiaries Consolidated Statements of Operations and Comprehensive Income [Abstract] Consolidated statements of operations and comprehensive income [Abstract] Income Statement [Abstract] Income Tax Authority [Domain] INCOME TAXES Income Tax Disclosure [Text Block] Income tax benefit (expense) (note 21) Total income tax benefit (expense) Income tax expense Income Tax Expense (Benefit) Income Taxes [Abstract] Income Tax Expense (Benefit), Continuing Operations [Abstract] Income Taxes Income Tax, Policy [Policy Text Block] Cash paid for income taxes Income tax recoverable Advances from customers Other long-term assets Increase (Decrease) in Other Noncurrent Assets Other long-term liabilities Increase (Decrease) in Other Noncurrent Liabilities Accounts receivable Increase (Decrease) in Accounts Receivable Income tax payable Accounts payable Increase (Decrease) in Accounts Payable Deferred revenue Increase (Decrease) in Deferred Revenue Inventory Increase (Decrease) in Inventories Net changes in operating assets and liabilities: Other payables and accrued expenses Income tax recoverable Increase (Decrease) in Income Taxes Receivable Other receivables Increase (Decrease) in Other Receivables Prepaid expenses Increase (Decrease) in Prepaid Expense Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Intangible Assets, Net Interest expense related to long-term borrowings incurred Interest expense Interest expense, net Interest Expense Capitalized interest charged as other long-term assets Interest Costs Capitalized Interest expense charged to long-term borrowings Interest expense related to short-term borrowings Interest Expense, Short-term Borrowings Interest paid, net of capitalized interest INVENTORIES [Abstract] Inventory [Line Items] Inventory reserve INVENTORIES Inventory Disclosure [Text Block] Inventory, Current [Table] Finished goods Total inventory Inventory, Gross Work in process Inventory Inventory, Policy [Policy Text Block] Inventories (note 5) Inventory, Net Inventory [Abstract] Inventory, Net [Abstract] Raw materials Investments [Domain] Interest income Interest income, net Investments Investment, Policy [Policy Text Block] Investment Type [Axis] Long-term investments (note 14) Total Investments Investment in unconsolidated subsidiaries TRADING SECURITIES [Abstract] Investments [Abstract] IPO [Member] Leases Lessee, Leases [Policy Text Block] LEASES Lessee, Operating Leases [Text Block] 2022 Lessee, Operating Lease, Liability, to be Paid, Year One Total lease payments Lessee, Operating Lease, Liability, to be Paid Less: Interest Lessee, Operating Lease, Liability, Undiscounted Excess Amount 2025 Lessee, Operating Lease, Liability, to be Paid, Year Four 2024 Lessee, Operating Lease, Liability, to be Paid, Year Three Maturities of Lease Liabilities for Operating Leases Lessee, Operating Lease, Liability, Maturity [Table Text Block] 2023 Lessee, Operating Lease, Liability, to be Paid, Year Two Weighted average remaining lease terms and discount rates [Abstract] Long-term Debt, Type [Axis] Long-term Debt, Type [Domain] Long-Term Borrowings [Abstract] Long-term Debt, Current and Noncurrent [Abstract] Components of lease expense [Abstract] Lease, Cost [Abstract] Lease cost Lease, Cost Components of Lease Expense Lease, Cost [Table Text Block] Leasehold Improvement [Member] LEASES [Abstract] Total liabilities Liabilities Liabilities and Stockholders' Equity Liabilities and Stockholders' Equity Liabilities and Stockholders' Equity [Abstract] Total liabilities and stockholders' equity Liabilities and Equity Total current liabilities Liabilities, Current Current liabilities: Line of Credit Facility [Line Items] Lender Name [Axis] Line of Credit Facility [Table] Maximum borrowing capacity Line of Credit Facility, Lender [Domain] Annual interest rate ACCOUNTS RECEIVABLE Loans, Notes, Trade and Other Receivables Disclosure [Text Block] Long-term debt Long-term Debt LONG-TERM BORROWINGS Principal Payments of Long-Term Loan [Abstract] Long-term Debt, Fiscal Year Maturity [Abstract] 2022 Long-Term Debt, Maturity, Year One LONG-TERM BORROWINGS [Abstract] Less: Current portion Current portion of long-term borrowings (note 12) LONG-TERM INVESTMENT [Abstract] 2025 Long-Term Debt, Maturity, Year Four 2023 Long-Term Debt, Maturity, Year Two Long-term Borrowings Long-term borrowings (note 12) 2024 Long-Term Debt, Maturity, Year Three Unrealized gain on trading securities Unrealized gain on trading securities Trading securities (note 16) Non-controlling interests Net income attributable to redeemable non-controlling interests Net Income (Loss) Attributable to Redeemable Noncontrolling Interest Net cash provided by financing activities Net cash provided by financing activities Cash flows from financing activities: Net Cash Provided by (Used in) Financing Activities [Abstract] Net cash flow (used in) provided by operating activities Net cash used in operating activities Cash flows from investing activities: Net Cash Provided by (Used in) Investing Activities [Abstract] Cash flows from operating activities: Net Cash Provided by (Used in) Operating Activities [Abstract] Net cash used in investing activities Net cash provided by investing activities Net income Net income attributable to ACM Research, Inc. Net Income (Loss) Attributable to Parent Numerator [Abstract] Net Income (Loss) Attributable to Parent [Abstract] Net income available to common stockholders, diluted Net Income (Loss) Available to Common Stockholders, Diluted Less: Net income attributable to non-controlling interests and redeemable non-controlling interests Less: Net income attributable to non-controlling interests and redeemable non-controlling interests Net income available to common stockholders, basic Net Income (Loss) Available to Common Stockholders, Basic Recent Accounting Pronouncements Non-cash financing activities: Noncash Investing and Financing Items [Abstract] Other income, net Number of reporting segments Number of Reportable Segments Non-controlling Interest [Member] Office Equipment [Member] Current portion of operating lease liability (note 11) Weighted average discount rate Long-term operating lease liability (note 11) Maturities of lease liabilities [Abstract] Lessee, Operating Lease, Liability, Payment, Due [Abstract] Operating cash outflow from operating leases Operating lease right-of-use assets, net (note 11) Operating lease cost Weighted average remaining lease term Present value of lease liabilities Operating loss carry-forwards, expiration date Operating expenses: Operating expenses [Abstract] Total operating expenses, net Operating Expenses Income from operations Operating Income (Loss) Net operating loss carry-forwards DESCRIPTION OF BUSINESS [Abstract] Other Long-Term Liabilities Other Noncurrent Liabilities [Table Text Block] Foreign currency translation adjustment Foreign currency translation adjustment OTHER LONG-TERM LIABILITIES [Abstract] Other receivables Other receivable Other payables and accrued expenses (note 10) Total Others Other Assets, Miscellaneous, Noncurrent Other Long-term Assets [Abstract] Other Assets, Noncurrent [Abstract] OTHER LONG-TERM ASSETS [Abstract] Other long-term assets (note 8) Total other long-term assets Other Assets, Noncurrent Other Long-term Liabilities [Abstract] Other Liabilities, Noncurrent [Abstract] OTHER LONG-TERM LIABILITIES Other long-term liabilities (note 13) Other long-term liabilities Other Investee [Member] Other income (expenses), net Other payable Others Foreign currency translation adjustment Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax, Portion Attributable to Parent Effect of foreign currency translation gain attributable to redeemable non-controlling interests Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Tax, Portion Attributable to Noncontrolling Interest OTHER PAYABLE AND ACCRUED EXPENSES [Abstract] Repayment of investment in cash Payments for (Proceeds from) Investments Payment for repurchase of Class A common stock Payments for Repurchase of Common Stock Purchase of trading securities Payments to Acquire Marketable Securities Purchase of intangible assets Payments to Acquire Intangible Assets Investments in unconsolidated affiliates Payments to Acquire Interest in Subsidiaries and Affiliates Purchase of property and equipment Payments to Acquire Property, Plant, and Equipment Plan Name [Domain] Plan Name [Axis] Prepaid expenses Reclassifications Proceeds from warrant exercise to common stock Dividends received from equity investee Dividends from unconsolidated affiliates Proceeds from sale of interest in subsidiary Proceeds from long-term borrowings Net proceeds of stock issuance cost Proceeds from Issuance Initial Public Offering Proceeds from issuance of Class A common stock in connection with public offering, net of direct issuance expenses of $2,287 Net proceeds from issuance of stock Proceeds from Issuance of Common Stock Proceeds from issuance of common stock to redeemable Non-controlling interest Proceeds from Noncontrolling Interests Proceeds from short-term borrowings Proceeds from stock option exercise to common stock Balance at beginning of period Balance at end of period Accrued warranty Product Warranty Liability [Line Items] Product Warranty Liability [Table] Net income Net income Property, Plant and Equipment [Line Items] PROPERTY, PLANT AND EQUIPMENT, NET Property, Plant and Equipment Disclosure [Text Block] Useful lives PROPERTY, PLANT AND EQUIPMENT, NET [Abstract] Property, Plant and Equipment Property, Plant and Equipment [Table Text Block] Long-Lived Tangible Asset [Axis] Property, Plant and Equipment, Net [Abstract] Property, Plant and Equipment, Gross [Abstract] Long-Lived Tangible Asset [Domain] Manufacturing equipment retired Property, plant and equipment, net (note 6) Total property, plant and equipment, net Property, Plant and Equipment, Net Property, Plant and Equipment, Policy [Policy Text Block] Total cost Property, Plant and Equipment [Abstract] Inventory [Axis] Inventory [Domain] ACCOUNTS RECEIVABLE [Abstract] Accounts Receivable Receivable [Policy Text Block] Receivables Receivables, Net, Current Aggregate Changes in Balance of Gross Unrecognized Tax Benefits [Abstract] Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] Balance Balance Redeemable Noncontrolling Interest, Equity, Carrying Amount Components of Change in Redeemable Non-controlling Interests Redeemable non-controlling interest RELATED PARTY BALANCES AND TRANSACTIONS [Abstract] Related Party Transaction [Line Items] Related Party Transaction [Abstract] Related Party Transaction, Due from (to) Related Party, Current [Abstract] Related Party [Axis] RELATED PARTY BALANCES AND TRANSACTIONS Related Party Transactions Disclosure [Text Block] Purchase of materials Related Party Transaction, Purchases from Related Party Related Party [Domain] Service fee charged by Repayments of notes Repayment of Notes Receivable from Related Parties Repayments of notes payable Repayments of Notes Payable Repayments of short-term borrowings Repayments of Lines of Credit Research and Development Costs Research and Development Expense, Policy [Policy Text Block] Research and development Research and development expenses Research and Development Expense [Member] Restricted cash Restricted Cash [Abstract] RESTRICTED NET ASSETS Accumulated Surplus (Deficit) [Member] Retained Earnings [Member] Accumulated surplus Statutory Reserves [Abstract] Revenue From Contracts With Customer [Abstract] Revenue Recognition Revenue from Contract with Customer [Policy Text Block] Revenue (note 3) Revenue Revenue From Contracts With Customer Expected term Expected term in years Weighted Average Grant Date Fair Value [Abstract] Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract] Outstanding weighed average remaining contractual term Forfeited/cancelled (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested Options Forfeited, Weighted Average Grant Date Fair Value Outstanding at end of period (in dollars per share) Outstanding at beginning of period (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Option, Nonvested, Weighted Average Exercise Price Percentage of shares owned by company after stock issuance Sale of Stock, Percentage of Ownership after Transaction Share price (in RMB per share) Sale of Stock [Domain] Revenue [Member] Revenue Benchmark [Member] Assumptions Used to Determine Fair Value of Share Options Granted Summary of Share Option Activities Share-based Payment Arrangement, Option, Activity [Table Text Block] Principal Payments for Outstanding Long-Term Loan Schedule of Maturities of Long-term Debt [Table Text Block] Warranty Obligations Schedule of Product Warranty Liability [Table Text Block] Inventory Schedule of Inventory, Current [Table Text Block] Related Party Balances and Transactions Schedule of Related Party Transactions [Table Text Block] Aggregate Changes in Balance of Gross Unrecognized Tax Benefits Deferred tax Assets Components of Stock-based Compensation Expense Share-based Payment Arrangement, Cost by Plan [Table Text Block] Effective Income Tax Rate Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] Components of Income Tax Benefit (Expense) Schedule of Components of Income Tax Expense (Benefit) [Table Text Block] Schedule of Finite-Lived Intangible Assets [Table] Basic and Diluted Net Income per Common Share Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Short-Term and Long-Term Borrowings Schedule of Debt [Table Text Block] Other Payable and Accrued Expenses Schedule of Accounts Payable and Accrued Liabilities [Table Text Block] Long-Term Borrowings Schedule of Long-term Debt Instruments [Table Text Block] Share-based Payment Arrangement, Expensed and Capitalized, Amount [Table] Schedule of Related Party Transactions, by Related Party [Table] Property, Plant and Equipment [Table] Other Long-term Assets Schedule of Other Assets, Noncurrent [Table Text Block] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Short-term Debt [Table] Schedule of Stock by Class [Table] Debt and Equity Securities, FV-NI [Line Items] Debt Securities, Trading, and Equity Securities, FV-NI [Table] Accounts Receivable Concentration of Credit Risk Schedules of Concentration of Risk, by Risk Factor [Table Text Block] SEGMENT INFORMATION [Abstract] SEGMENT INFORMATION Sales and Marketing Expense [Member] Sales and marketing Sales and marketing expenses Sales and marketing expenses Selling and Marketing Expense Senior Secured Promissory Note [Member] Weighted Average Exercise Price [Abstract] Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract] Granted (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross Forfeited/cancelled (in dollars per share) Share-based Compensation Arrangements by Share-based Payment Award, Options, Forfeitures in Period, Weighted Average Exercise Price Fair value of common share (in dollars per share) Stock price (in dollars per share) Share Price Stock-based Compensation Expense [Abstract] Share-based Payment Arrangement, Noncash Expense [Abstract] Stock-based compensation Share-based Payment Arrangement, Noncash Expense Expired (in dollars per share) Share-based Compensation Arrangements by Share-based Payment Award, Options, Expirations in Period, Weighted Average Exercise Price Exercised (in dollars per share) Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Granted (in dollars per share) Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price Expected dividend Stock-Based Compensation [Abstract] Share-based Compensation Arrangement by Share-based Payment Award, Additional General Disclosures [Abstract] Fair Value of Options Granted [Abstract] Risk-free interest rate Expired (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Expirations in Period Vested and exercisable (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number Volatility Forfeited/cancelled (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period Weighed Average Remaining Contractual Term [Abstract] Outstanding, end of period (in shares) Outstanding, beginning of period (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number Outstanding, beginning of period (in dollars per share) Outstanding, end of period (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price Granted (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value Number of Option Share [Roll Forward] Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] Award Type [Domain] Stock-based Compensation Share-based Payment Arrangement [Policy Text Block] Share price (in dollars per share) Shares issued (in shares) Shares, Issued Ending balance (in shares) Beginning balance (in shares) Shares, Outstanding Shipping and Handling [Member] SHORT-TERM BORROWINGS Short-term Debt [Text Block] Short-term Debt [Line Items] Short-term borrowings (note 9) Short-term borrowings Short-term lease cost SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Significant Accounting Policies [Text Block] Warranty Standard Product Warranty, Policy [Policy Text Block] Warranty [Abstract] U.S. State [Member] State and Local Jurisdiction [Member] Consolidated Balance Sheets [Abstract] Consolidated balance sheets [Abstract] Class of Stock [Axis] Statement [Table] Statement [Line Items] Consolidated Statements of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Equity Components [Axis] Consolidated Statements of Changes in Stockholders' Equity [Abstract] Statutory surplus reserve Cancellation of stock options Shares Issued, Value, Share-based Payment Arrangement, Forfeited Exercise of stock options (in shares) Stock issued upon exercise of stock options (in shares) Exercised (in shares) Issuance of Class A common stock in connection with public offering (in shares) Shares issued (in shares) Offering of shares (in shares) Conversion of Class B common stock to Class A common stock (in shares) Conversion of class B common shares to Class A common shares (in shares) Stock Issued During Period, Shares, Conversion of Units Share repurchase Stock Repurchased During Period, Value Share cancellation Stock Repurchased and Retired During Period, Value Exercise of stock options Stock Issued During Period, Value, Stock Options Exercised Share cancellation (in shares) Stock Repurchased and Retired During Period, Shares Issuance of Class A common stock in connection with public offering Shares issued value Stock Issued During Period, Value, New Issues Conversion of Class B common stock to Class A common stock Stock Issued During Period, Value, Conversion of Units Number of shares repurchased/surrender in exchange (in shares) Stock repurchase (in shares) Share repurchase (in shares) Reverse stock split Total ACM Research, Inc. stockholders' equity Total stockholders' equity Stockholders' Equity Attributable to Parent COMMON STOCK Stockholders' Equity Note Disclosure [Text Block] Beginning balance Ending balance Total stockholders' equity Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest Stockholders' equity: Stockholders' equity: Sale of Stock [Axis] Supplemental disclosure of cash flow information: Tax credit carry-forwards, expiration date Components of Trading Securities Cost Transportation Equipment [Member] Ending balance Beginning balance Unrecognized Tax Benefits Increase of unrecognized tax benefits taken in prior years Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions Reductions for tax positions related to prior years Unrecognized Tax Benefits, Decrease Resulting from Prior Period Tax Positions Reductions to unrecognized tax benefits related to lapsing statute of limitations Unrecognized Tax Benefits, Reduction Resulting from Lapse of Applicable Statute of Limitations Unrecognized tax benefits that would impact effective tax rate Increase of unrecognized tax benefits related to current year Unrecognized Tax Benefits, Increase Resulting from Current Period Tax Positions Accrued penalties Use of Estimates Use of Estimates, Policy [Policy Text Block] Increase (decrease) in valuation allowance Fair value warrant amount Weighted average shares outstanding, diluted (in shares) Diluted (in shares) Effect of dilutive securities (in shares) Weighted Average Number Diluted Shares Outstanding Adjustment Weighted average shares outstanding, basic (in shares) Basic (in shares) Weighted Average Number of Shares Outstanding, Basic Weighted average common shares outstanding used in computing per share amounts (note 2): Condensed Cash Flow Statement [Table] Condensed Income Statements, Captions [Line Items] Condensed Cash Flow Statements, Captions [Line Items] Condensed Balance Sheet Statement [Table] PARENT COMPANY ONLY CONDENSED FINANCIAL INFORMATION [Abstract] Condensed Balance Sheet Statements, Captions [Line Items] Condensed Income Statement [Table] Consolidated Entities [Domain] Consolidated Entities [Axis] Currency [Axis] Customer [Axis] Maximum [Member] Minimum [Member] Customer [Domain] Product and Service [Domain] Parent Company [Member] Product and Service [Axis] Statistical Measurement [Domain] Statistical Measurement [Axis] Condensed Statement of Operations Condensed Statement of Cash Flows Condensed Balance Sheet Geographical [Domain] Geographical [Axis] Subsidiaries [Member] Subsidiaries [Member] Subsidiaries [Member] PRC [Member] Mainland China [Member] United States [Member] UNITED STATES Cover [Abstract] Document Information [Table] Document Information [Line Items] Document Type Document Annual Report Document Transition Report Entity Interactive Data Current Amendment Flag ICFR Auditor Attestation Flag Document Fiscal Year Focus Document Fiscal Period Focus Document Period End Date Entity Registrant Name Entity Central Index Key Entity File Number Entity Tax Identification Number Entity Incorporation, State or Country Code Current Fiscal Year End Date Entity Well-known Seasoned Issuer Entity Voluntary Filers Entity Current Reporting Status Entity Shell Company Entity Filer Category Entity Small Business Entity Emerging Growth Company Entity Public Float Entity Address, Address Line One Entity Address, City or Town Entity Address, State or Province Entity Address, Postal Zip Code City Area Code Local Phone Number Title of 12(b) Security Trading Symbol Security Exchange Name Entity Common Stock, Shares Outstanding RMB [Member] China, Yuan Renminbi KRW [Member] Korea (South), Won All Currencies [Domain] Auditor Name Auditor Location Auditor Firm ID Amount of increase (decrease) in financial liability carried at fair value and obligation of for which consideration has been received or is receivable. Increase (Decrease) in Financial Liability Carried at Fair Value Change in fair value of financial liability Change in fair value of financial liability Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income (loss) and other comprehensive income (loss), attributable to noncontrolling interests and redeemable noncontrolling interests. Excludes changes in equity resulting from investments by owners and distributions to owners. Comprehensive Income (Loss) Attributable To Non Controlling Interests and Redeemable Non Controlling Interests Less: Comprehensive income attributable to non-controlling interests and redeemable non-controlling interests Tabular disclosure of translations of foreign exchange rate. Schedules of Translations of Foreign Exchange Rate [Table Text Block] Translations of Foreign Exchange Rate Tabular disclosure of the estimated useful lives of assets. Schedule Of Estimated Useful Lives For Property And Equipment [Table Text Block] Estimated Useful Lives of Property, Plant and Equipment Land use right represents the cost to purchase land use right. Land use right net Land use right net Land use right, net (note 7) Carrying amount as of the balance sheet date of the unpaid sum of the known and estimated amounts payable. Income Taxes, Current, Payable and Deferred Tax Liabilities FIN-48 payable FIN-48 payable (note 20) The long lived, depreciable assets and tangible personal property used in an office setting. Computer and Office Equipment [Member] Computer and Office Equipment [Member] Equipment used for the primary purpose of manufacturing the product. Manufacturing Equipment [Member] Equipment that involves the controlled conduction of electrons (especially in a gas or vacuum or semiconductor) amplifier - electronic equipment that increases strength of signals passing through it. Electronic Equipment [Member] Electronic Equipment [Member] The entire disclosure for other noncurrent assets. Other Assets, Non-Current Disclosure [Text Block] OTHER LONG-TERM ASSETS Value of stock issued as a result of the exercise of stock warrants. Stock Issued During Period, Value, Common Stock Warrant Exercised Exercise of stock warrants Number of share warrants (or share units) exercised during the current period. Stock Issued During Period, Shares, Common Stock Warrant Exercised Exercise of stock warrants (in shares) Exercise of common stock warrant issued (in shares) The amount of reclassification of redeemable noncontrolling interest holders. Reclassification of Redeemable Non Controlling Interest Reclassification of redeemable non-controlling interest Reclassification of redeemable non-controlling interest The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest and excluding the portion attributable to redeemable noncontrolling interest. Net income excluding redeemable non-controlling interest Net income Number of shares of subsidiary equity issued during the period. Subsidiary Equity Issued During Period, Shares Proceeds from a subsidiary equity issuance, net of issuance costs (in shares) Equity impact of the value of subsidiary equity issuance, net of issuance cost. Subsidiary Equity Issued During Period, Value, Net of Issuance Costs Proceeds from a subsidiary equity issuance, net of issuance costs Intangible assets amortization period, if neither the contract nor local law specifies a beneficial period, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Intangible Assets Amortization Period, Condition Intangible assets amortization period, if neither the contract nor local law specifies a beneficial period LAND USE RIGHT, NET [Abstract] The entire disclosure for land use rights, net. Land Use Rights, Net [Text Block] LAND USE RIGHT, NET The cash outflow to cancel common stock during the period. Payment for Cancellation of Stock Options Payment for cancellation of stock option Reconciliation of cash, cash equivalents and restricted cash in condensed consolidated statements of cash flows: [Abstract] Reconciliation of cash, cash equivalents and restricted cash in condensed consolidated statements of cash flows: Conversion of warrants to common stock. Warrant conversion to common stock Warrant conversion to common stock Refers to the amount of recognized change of the fair value in financial liability. Change in fair value of financial liability Change in fair value of financial liability The cash outflow for acquisition of land-use-right; excludes purchases of land as inventory or as investments. Payments To Acquire of land-use-right Purchase of land-use-right Amount of cash outflow for the purchase of property. Pre Payment For Property Prepayment for property The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer. Repayments of Long-term Borrowing Repayments of long-term borrowings Value of stock that has been repurchased during the period and has not been retired and is not held in treasury. Share cancellation Share cancellation, (note 16) The amount of warrants issued for settlement of financial liability. Issuance of warrant for settlement of financial liability Issuance of warrant for settlement of financial liability and cancellation of note receivable The increase (decrease) during the period in the amount due for taxes based on the reporting entity's earnings or attributable to the entity's income earning process within a given jurisdiction. Increase (Decrease) in Payable and Deferred Tax Liabilities FIN-48 payable Cashless exercise of stock options. Cashless Exercise of Stock Options Cashless exercise of stock options The cash inflow from issuance of subsidiary equity, net of issuance costs. Proceeds From Subsidiary Equity Issuance, Net of Issuance Costs Proceeds from a subsidiary equity issuance, net of issuance costs This element represents the cash inflow from the net of direct expenses to the entity. Proceeds from Issuance of Net of Direct Expenses Direct issuance expenses The construction project for a new project for the development and production center that will incorporate new manufacturing systems and automation technologies, and will provide floor space to support significantly increase production capacity and related research and development activities. Area of Square Foot for Development and Production Center Area for development and production center Land use Right [Abstract] Amount of accumulated amortization on land use right. Land use Right, Accumulated Amortization Less: accumulated amortization Annual Amortization of Land use Right [Abstract] Amount of annual amortization expense for land use right, expected to be recognized in fifth fiscal year following current fiscal year. Amortization of Land Use Right Due Year Five 2025 Amount of annual amortization expense for land use right, expected to be recognized in second fiscal year following current fiscal year. Amortization of Land Use Right Due Year Two 2022 Entity owned or controlled by another entity. Shengwei Research (Shanghai), Inc. [Member] Shengwei Research (Shanghai), Inc. [Member] Right to use land lease term, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Right to Use Land Lease Term Right to use land lease term Amount of annual amortization expense for land use right, expected to be recognized in fourth fiscal year following current fiscal year. Amortization of Land Use Right Due Year Four 2024 The carrying amount as of the balance sheet date of land not owned but under a contract in which the entity has an option to purchase the land. Land use Right, Purchase Amount Land use right purchase amount Amount of annual amortization expense for land use right, expected to be recognized in third fiscal year following current fiscal year. Amortization of Land Use Right Due Year Three 2023 Amount of annual amortization expense for land use right, expected to be recognized in next twelve months following current fiscal year. Amortization of Land Use Right Due Next Twelve Months 2021 A table or schedule providing information pertaining to translations of foreign exchange rate. Schedule of Translations of Foreign Exchange Rate [Table] Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. Translations of Foreign Exchange Rates [Line Items] Translations of Foreign Exchange Rate [Abstract] Translations of Foreign Exchange Rate [Abstract] Foreign Currency Risk and Translation [Abstract] Foreign Currency Risk and Translation [Abstract] Concentration of Credit Risk [Abstract] Concentration of Credit Risk [Abstract] Foreign exchange rate used to translate amounts denominated in functional currency to reporting currency. Foreign Currency Exchange Rate, Translation2 Exchange rate Number of major customers who contributes 10% or more of entity's total revenue. Number of Major Customers Number of major customers Single external customer or group of external customers. Customer [Member] Name of the significant customer. Customer C [Member] Customer C [Member] Name of the significant customer. Customer A [Member] Customer A [Member] Name of the significant customer. Customer B [Member] Customer B [Member] Name of the significant customer. Customer D [Member] Disclosure of accounting policy for basis of presentation and principles of consolidation, used to prepare the financial statements. Basis of Presentation and Principles of Consolidation [Policy Text Block] Basis of Presentation and Principles of Consolidation Disclosure of accounting policy for government subsidies. Government Subsidies [Policy Text Block] Government Subsidies Disclosure of accounting policy for COVID-19 assessment. COVID-19 Assessment [Policy Text Block] COVID-19 Assessment Disclosure of accounting policy for land use rights, net. Land Use Rights, Net [Policy Text Block] Land Use Rights, Net Disclosure of accounting policy for statutory reserves. Statutory Reserves [Policy Text Block] Statutory Reserves Disclosure of accounting policy for operating and financial risks. Operating and Financial Risks [Policy Text Block] Operating and Financial Risks Disclosure of accounting policy for the classification of shipping and handling costs, including whether the costs are included in cost of sales or included in other income statement accounts. If shipping and handling fees are significant and are not included in cost of sales, disclosure includes both the amounts of such costs and the line item on the income statement which includes such costs. Shipping and Handling Costs, Policy [Policy Text Block] Shipping and Handling Costs The maximum period in which finished goods typically are shipped from the warehouse in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days Maximum Shipment Period of Finished Goods from Warehouse Maximum shipment period of finished goods from warehouse FINANCIAL LIABILITY CARRIED AT FAIR VALUE [Abstract] The entire disclosure for the financial liability for fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information. Financial Liability Carried at Fair Value Disclosures [Text Block] FINANCIAL LIABILITY CARRIED AT FAIR VALUE The standard warranty period of the product, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Standard Product Warranty Period Standard assurance type warranty period A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. Warranty Obligations [Roll Forward] Warranty Obligations [Roll Forward] The amount of utilized product warranty accrual. Product Warranty Accrual Utilized Utilized The amount of increase in the product warranty accrual. Product Warranty Accrual Additions Additions The entire disclosure for trading securities. Trading Securities [Text Block] TRADING SECURITIES Finished goods inventory shipped to existing or prospective customers. First-Tools [Member] Finished goods in which customers are obligated to take ownership upon acceptance. Contractual Obligation [Member] Amount of security deposit for land use right paid in advance. Security Deposit for Land Use Right Security deposit for land use right Amount of property related to consideration paid in advance for costs that provide economic benefits in future periods, and amount of other assets that are expected to be realized or consumed after one year or the normal operating cycle, if longer. Prepayment for Property, Non Current Prepayment for property - Lingang Amount of property, plant and equipment and other non-current assets related to consideration paid in advance for costs that provide economic benefits in future periods, and amount of other assets that are expected to be realized or consumed after one year or the normal operating cycle, if longer. Prepayment for Property, Plant and Equipment and Other non-Current Assets Prepayment for property, plant and equipment and other non-current assets Amount of lease deposit related to consideration paid in advance for costs that provide economic benefits in future periods, and amount of other assets that are expected to be realized or consumed after one year or the normal operating cycle, if longer. Prepayment for Property - Lease Deposit Prepayment for property - lease deposit Shipping and Handling Costs [Abstract] Shipping and Handling Costs [Abstract] Tabular disclosure of weighted average remaining lease terms and discount rates for operating leases. Lessee, Operating Lease, Weighted Average Remaining Lease Term and Discount Rate [Table Text Block] Weighted Average Remaining Lease Terms and Discount Rates for Operating Leases Tabular disclosure of lessee's operating lease supplemental cash flow information. Lessee Operating Lease Supplemental Cash Flow Information Related to Operating Leas [Table Text Block] Supplemental Cash Flow Information Related to Operating Leases Amount, after allowance, receivable from customers, clients, or other third-parties, and receivables classified as other due within one year or the normal operating cycle, if longer. Other Receivables Current [Member] Other Receivables [Member] Cash delivered by related party as of the close of business. Cash Delivered as of Close of Business Payment for investment Number of agreements relating to outstanding obligations among parent and subsidiaries. Number of Agreements Number of agreement Consideration is accounted for as a financial liability, and the company applies fair value option. Consideration Price in Fair Value Consideration price in fair value Name of related party. Shengxin (Shanghai) Management Consulting Limited Partnership [Member] SMC [Member] SMC [Member] Entity owned or controlled by another entity. ACM Research (Shanghai), Inc. [Member] ACM Shanghai [Member] ACM Research (Shanghai), Inc. [Member] A promissory note between parent organization and subsidiary. Intercompany Note [Member] Investment repayment period after exercise of warrant, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Investment Repayment Period Investment repayment period Name of the class or type of 2020 warrants. Shengxin (Shanghai) Management Consulting Limited Partnership 2020 Warrants [Member] SMC 2020 Warrants [Member] Tabular disclosure of the significant assumptions used during the year to estimate the fair value of warrants, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. Schedule of Share-based Payment Award, Warrants, Valuation Assumptions [Table Text Block] Assumptions Used to Determine Fair Value of Warrants A contractual arrangement with a lender under which borrowings can be made up to a specific amount at any point in time, and under which borrowings outstanding may be either short-term or long-term, depending upon the particulars. Line of Credit 16 [Member] Line of Credit Due on May 28, 2021 [Member] A contractual arrangement with a lender under which borrowings can be made up to a specific amount at any point in time, and under which borrowings outstanding may be either short-term or long-term, depending upon the particulars. Line of Credit 12 [Member] Line of Credit Due on April 12, 2021 [Member] A contractual arrangement with a lender under which borrowings can be made up to a specific amount at any point in time, and under which borrowings outstanding may be either short-term or long-term, depending upon the particulars. Line of Credit 4 [Member] Line of Credit Due on January 22, 2020 [Member] A contractual arrangement with a lender under which borrowings can be made up to a specific amount at any point in time, and under which borrowings outstanding may be either short-term or long-term, depending upon the particulars. Line of Credit 14 [Member] Line of Credit Due on May 27, 2021 [Member] A contractual arrangement with a lender under which borrowings can be made up to a specific amount at any point in time, and under which borrowings outstanding may be either short-term or long-term, depending upon the particulars. Line of Credit 7 [Member] Line of Credit Due on April 17, 2020 [Member] A contractual arrangement with a lender under which borrowings can be made up to a specific amount at any point in time, and under which borrowings outstanding may be either short-term or long-term, depending upon the particulars. Line Of Credit 29 [Member] Line of Credit Due on October 25, 2022 [Member] A contractual arrangement with a lender under which borrowings can be made up to a specific amount at any point in time, and under which borrowings outstanding may be either short-term or long-term, depending upon the particulars. Line of Credit 25 [Member] Line of Credit Due on June 7, 2022 [Member] A contractual arrangement with a lender under which borrowings can be made up to a specific amount at any point in time, and under which borrowings outstanding may be either short-term or long-term, depending upon the particulars. Line of Credit 18 [Member] Line of Credit Due on June 16, 2021 [Member] A contractual arrangement with a lender under which borrowings can be made up to a specific amount at any point in time, and under which borrowings outstanding may be either short-term or long-term, depending upon the particulars. Line of Credit 11 [Member] Line of Credit Due on June 27, 2021 [Member] A contractual arrangement with a lender under which borrowings can be made up to a specific amount at any point in time, and under which borrowings outstanding may be either short-term or long-term, depending upon the particulars. Line of Credit 10 [Member] Line of Credit Due on April 29, 2021 [Member] A contractual arrangement with a lender under which borrowings can be made up to a specific amount at any point in time, and under which borrowings outstanding may be either short-term or long-term, depending upon the particulars. Line of Credit 2 [Member] Line of Credit Due on February 21, 2020 [Member] A contractual arrangement with a lender under which borrowings can be made up to a specific amount at any point in time, and under which borrowings outstanding may be either short-term or long-term, depending upon the particulars. Line of Credit 8 [Member] Line of Credit Due on April 1, 2021 [Member] A contractual arrangement with a lender under which borrowings can be made up to a specific amount at any point in time, and under which borrowings outstanding may be either short-term or long-term, depending upon the particulars. Line of Credit 15 [Member] Line of Credit Due on June 27, 2021 [Member] A contractual arrangement with a lender under which borrowings can be made up to a specific amount at any point in time, and under which borrowings outstanding may be either short-term or long-term, depending upon the particulars. Line of Credit 5 [Member] Line of Credit Due on February 14, 2020 [Member] A contractual arrangement with a lender under which borrowings can be made up to a specific amount at any point in time, and under which borrowings outstanding may be either short-term or long-term, depending upon the particulars. Line of Credit 19 [Member] Line of Credit Due on August 10, 2021 [Member] A contractual arrangement with a lender under which borrowings can be made up to a specific amount at any point in time, and under which borrowings outstanding may be either short-term or long-term, depending upon the particulars. Line of Credit 6 [Member] Line of Credit Due on March 25, 2020 [Member] A contractual arrangement with a lender under which borrowings can be made up to a specific amount at any point in time, and under which borrowings outstanding may be either short-term or long-term, depending upon the particulars. Line of Credit 1 [Member] Line of Credit Due on January 23, 2020 [Member] A contractual arrangement with a lender under which borrowings can be made up to a specific amount at any point in time, and under which borrowings outstanding may be either short-term or long-term, depending upon the particulars. Line of Credit 9 [Member] Line of Credit Due on June 27, 2021 [Member] A contractual arrangement with a lender under which borrowings can be made up to a specific amount at any point in time, and under which borrowings outstanding may be either short-term or long-term, depending upon the particulars. Line of Credit 17 [Member] Line of Credit Due on June 7, 2021 [Member] A contractual arrangement with a lender under which borrowings can be made up to a specific amount at any point in time, and under which borrowings outstanding may be either short-term or long-term, depending upon the particulars. Line Of Credit 28 [Member] Line of Credit Due on October 21, 2022 [Member] A contractual arrangement with a lender under which borrowings can be made up to a specific amount at any point in time, and under which borrowings outstanding may be either short-term or long-term, depending upon the particulars. Line of Credit 13 [Member] Line of Credit Due on May 24, 2021 [Member] A contractual arrangement with a lender under which borrowings can be made up to a specific amount at any point in time, and under which borrowings outstanding may be either short-term or long-term, depending upon the particulars. Line of Credit 3 [Member] Line of Credit Due on January 18, 2020 [Member] A contractual arrangement with a lender under which borrowings can be made up to a specific amount at any point in time, and under which borrowings outstanding may be either short-term or long-term, depending upon the particulars. Line of Credit 20 [Member] Line of Credit Due on August 25, 2021 [Member] Supplemental Cash Flow Information Related to Operating Leases [Abstract] Supplemental cash flow information related to operating leases [Abstract] Government Subsidies [Abstract] Government Subsidies [Abstract] Amount of government subsides recognized as reductions of relevant expenses. Government Subsidies Recognized as Reductions of Relevant Expenses Subsidies recognized as reductions of relevant expenses The number of grants received from the PRC's Ministry of Science and Technology. Number of Grants Received Number of grants received Amount of government subsides recognized as other income during the period. Government Subsidies Recognized as Other Income Subsidies recognized as other income Name of related party. Shanghai Zhangjiang Group Co., Ltd. [Member] Shanghai Zhangjiang Group Co., Ltd. [Member] Name of related party. Ninebell Co., Ltd [Member] Ninebell Co., Ltd [Member] Amount for prepaid expense to related parties. Related Party Transaction, Prepaid Expense from Related Party Prepaid expenses Name of the companies a Chinese limited partnership. Qingdao Fortune-Tech Xinxing Capital Partnership [Member] Qingdao LP [Member] Name of the companies a Chinese limited partnership. Semiconductor Manufacturing International Corporation [Member] SMIC [Member] The amount of investment in partnership. Investment in Partnership Investment in partnership Trading Securities Listed in Shanghai Stock Exchange [Abstract] Trading securities listed in Shanghai Stock Exchange [Abstract] The market value of investments in trading equity securities and other forms of trading securities that provide ownership interests. Debt Securities, Trading Securities, Equity Market value The percentage ownership in Partnership's total subscribed capital. Ownership Percentage in Partnership Ownership percentage in partnership Total fund of the Partnership which was contributed by limited partners. Capital Fund of Limited Partnership Total capital fund of limited partnership Subsidies to Tahoe-Single Bench Clean, commenced in 2020. Subsidies to Tahoe-Single Bench Clean, Commenced in 2020 [Member] Subsidies to Tahoe-Single Bench Clean, Commenced in 2020 [Member] Other items related to other long-term liabilities. Other [Member] Other [Member] Subsidies to SW Lingang R&D development in 2021. Subsidies to SW Lingang R&D development in 2021 [Member] Subsidies to SW Lingang R&D development in 2021 [Member] Subsidies to polytetrafluoroethylene, commenced in 2018. Subsidies to Polytetrafluoroethylene [Member] Subsidies to Polytetrafluoroethylene, Commenced in 2018 [Member] Subsidies to other cleaning tools, commenced in 2020. Subsidies to Other Cleaning Tools, Commenced in 2020 [Member] Subsidies to Other Cleaning Tools, Commenced in 2020 [Member] Subsidies to electro copper plating project, commenced in 2014. Subsidies to Electro Copper Plating project [Member] Subsidies to Electro Copper Plating Project, Commenced in 2014 [Member] Subsidies to stress free polishing project, commenced in 2008 and 2017. Subsidies to Stress Free Polishing project [Member] Subsidies to Stress Free Polishing Project, Commenced in 2008 and 2017 [Member] Number of installments for loan repayable to bank. Number of Installments for Loan Repayable Number of installments for loan repayable Refers to number of loans in a debt instrument. Debt Instruments, Number of Loans Number of loans Amount borrowed from the bank on September 2021 with the annual interest rate is 2.6%. Loan Two [Member] Loan 2 [Member] Amount borrowed from the bank on June 2021 with the annual interest rate is 2.6%. Loan One [Member] Loan 1 [Member] Name of the lender. Bank of China [Member] Bank of China [Member] Name of the lender. China Merchants Bank [Member] China Merchants Bank [Member] Amount of long-term debt payable, sinking fund requirement, and other securities issued that are redeemable by holder at fixed or determinable price and date, maturing fifth fiscal year and after following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). Long Term Debt Maturities Repayments Of Principal Year Five and After 2026 and onwards The entire disclosure for long-term investment. long-term investment [Text Block] LONG-TERM INVESTMENT A container table for all schedule of long-term investment. Long-Term Investment [Table] Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. Long-Term Investment [Line Items] Name of the companies components suppliers. Shengyi Semiconductor Technology Company Limited [Member] Shengyi [Member] The number of investors with agreements entered pursuant to qualifying for the Listing and IPO. Number of Investors with Agreements Entered Number of investors with agreements entered Name of the companies components suppliers. Waferworks Company Limited [Member] Waferworks [Member] Name of the companies a Chinese limited partnership. Hefei Shixi Chanheng Integrated Circuit Industry Venture Capital Fund Partnership [Member] Hefei Shixi [Member] Name of the companies principal material supplier. Ninebell Company Limited [Member] Ninebell [Member] Classification of Investments [Abstract] Classification of Investments [Abstract] Long-term investments excluding other. Investment Excluding Other [Member] Investment Excluding Other Investee [Member] Tabular disclosure of long-term investment. Long-Term Investment [Table Text Block] Long-Term Investment Disclosure of information about income taxes. Income Taxes [Table] Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. Income Taxes [Line Items] Information about deferred tax assets liabilities translation difference. Translation difference Amount of deferred tax liability attributable to taxable temporary differences from equity investments. Deferred Tax Liabilities Equity Investments Equity Investments Percentage of foreign tax rate. Foreign corporate tax rate Operating loss carryforwards are subject to annual limitation as a result of the ownership change. Operating Loss Carryforwards Subject to Annual Limitation Ownership Change Net operating loss carryforwards subject to annual limitation ownership change Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from lease liability. Deferred Tax Assets, Lease Liability Lease liability Effective period for entities certified as "advanced and new technology enterprises" to receive preferential income tax rate, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Effective Period of Preferential Income Tax Rate Effective period of preferential income tax rate The number of common shares reserved for issuance as dividends. Additional shares reserved for issuance as dividends Additional shares reserved for issuance as dividends (in shares) The additional number of common shares permitted to be issued by an entity's charter and bylaws. Common stock, additional shares authorized Common stock, additional shares authorized (in shares) Number of votes entitled for each share of common stock. Voting Rights per Share Number of votes for each share entitled The amount of underwriting discount and offering expenses on issuance of stock. Underwriting Discount and Offering Expenses Underwriting discount and offering expenses RESTRICTED NET ASSETS [Abstract] REDEEMABLE NON-CONTROLLING INTERESTS [Abstract] The entire disclosure for a redeemable non-controlling interests. Redeemable Non-Controlling Interests [Text Block] REDEEMABLE NON-CONTROLLING INTERESTS Change in Redeemable Noncontrolling Interests [Abstract] Change in Redeemable Noncontrolling Interests [Abstract] Tabular disclosure of the entity's subsidiaries and information of their direct or indirect interests with date, state of incorporation information. Direct or Indirect Interests in Subsidiaries [Table Text Block] Direct or Indirect Interests of Subsidiaries Disaggregated Revenue Information [Abstract] Goods and Services produced, developed and distributed by the entity. Advanced Packaging (exclude ECP), Services & Spares [Member] Advanced Packaging (Excluding ECP), Services & Spares [Member] Goods and Services produced, developed and distributed by the entity. Total Single Wafer and Semi-Critical Cleaning Equipment [Member] Single Wafer Cleaning, Tahoe and Semi-Critical Cleaning Equipment [Member] Goods and Services produced, developed and distributed by the entity. Advanced Packaging Other Processing Services and Spares [Member] Advanced Packaging, Other Processing Tools, Services and Spares [Member] Goods and Services produced, developed and distributed by the entity. Wet Cleaning And Other Front End Processing Tools [Member] Wet Cleaning and Other Front-end Processing Tools [Member] Goods and Services produced, developed and distributed by the entity. ECP Front End And Packaging Furnace And Other Technologies [Member] ECP (Front-end and Packaging), Furnace and Other Technologies [Member] Represents other regions. Oher Regions [Member] Entity owned or controlled by another entity. CleanChip Technologies Limited [Member] CleanChip Technologies Limited [Member] Entity owned or controlled by another entity. ACM Research (CA), Inc. [Member] Entity owned or controlled by another entity. ACM Research Korea CO., LTD [Member] Entity owned or controlled by another entity. ACM Research (Cayman), Inc. [Member] Entity owned or controlled by another entity. ACM Research (Wuxi), Inc. [Member] Business Description [Abstract] Description of Business [Abstract] Name of entity owned or controlled by another entity. Name of Subsidiary Name of subsidiaries Term to complete listing of shares of ACM Shanghai on the Shanghai Stock Exchange's new Sci-Tech innovation board known as Star Market, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Term to Complete Listing of Shares Term to complete listing of shares Percentage of equity interests acquired at the acquisition date in the business combination. Business Acquisition, Percentage of Equity Interests Acquired Purchase of equity interest percentage Information of place and date of incorporation of an entity. Name of Date of Incorporation Place and date of incorporation The percentage of ownership of common stock or equity participation of subsidiaries. Subsidiaries Ownership Percentage Effective interest held as at Entity owned or controlled by another entity. ACM Research (Singapore) PTE. LTD. [Member] Percentage amount of shares offered from shares outstanding in reference to IPO. Percentage amount of shares offered from shares outstanding Percentage amount of shares offered from shares outstanding Fair value of option grants in period, valuation model assumptions based on service period. Service Period Based Approach [Member] Service Period Based [Member] Fair value of option grants in period, valuation model assumptions based on market condition. Market Based [Member] Market Based [Member] Carrying value as of the balance sheet date of obligations incurred through that date and payable for machine testing fees. Accrued Machine Testing Fees, Current Accrued machine testing fees Share-based payment arrangement of non employee stock option granting right, subject to vesting and other restrictions, to purchase or sell certain number of shares at predetermined price for specified period of time. Share-based Payment Arrangement, Non Employee Stock Option [Member] Non-Employee Stock Option [Member] Non-Employee Stock Purchase Plan [Member] Weighted average grant-date fair value of non-vested options exercised. Share-based Compensation Arrangement by Share-based Payment Award Options Exercised in Period Weighted Average Grant Date Fair Value Exercised (in dollars per share) Weighted average grant-date fair value of non-vested options expired. Share-based Compensation Arrangement by Share-based Payment Award Options Expired in Period Weighted Average Grant Date Fair Value Expired (in dollars per share) Tabular disclosure of land use rights, net. Land Use Rights, Net [Table Text Block] Land Use Rights Tabular disclosure of annual amortization of land use right. Annual Amortization of Land Use Right [Table Text Block] Annual Amortization of Land Use Right