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 Accounts Payable, Related Parties, Current Accounts receivable Accounts Receivable, before Allowance for Credit Loss, Current Accounts receivable, less allowance for doubtful accounts of $0 as of June 30, 2021 and December 31, 2020 (note 4) Total Accounts Receivable [Member] Accounts Receivable [Abstract] Accounts Receivable, after Allowance for Credit Loss, Current [Abstract] Accrued professional fees Accrued commissions Income taxes payable (note 21) Capitalized interest charges related to property Accumulated other comprehensive income Accumulated Other Comprehensive Income (Loss) [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] 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 Stock-based compensation expense Share-based Payment Arrangement, Expense Accounts receivable, allowance for doubtful accounts Less: Allowance for doubtful accounts Total assets Assets Assets Assets Assets [Abstract] Total current assets Assets, Current Current assets: Current assets: DESCRIPTION OF BUSINESS Business Description and Basis of Presentation [Text Block] Net decrease in cash, cash equivalents and restricted cash Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect Cash, cash equivalents and restricted cash at end of period Cash, cash equivalents and restricted cash at beginning of period Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents Cash paid for amounts included in the measurement of lease liabilities [Abstract] Cash Flow, Operating Activities, Lessee [Abstract] Cash and cash equivalents 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 21) 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, 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) Income Tax Benefit (Expense) [Abstract] Comprehensive Income Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest Comprehensive income: Comprehensive income (loss) attributable to ACM Research, Inc. Comprehensive Income (Loss), Net of Tax, Attributable to Parent 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] Concentration of Credit Risk Concentration Risk, Credit Risk, Policy [Policy Text Block] 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 [Member] 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] Debt Instrument [Axis] Promissory note principal amount Debt Instrument, Face Amount Schedule of Long-term Debt Instruments [Table] Debt Instrument [Line Items] Interest rate on promissory note Debt Instrument, Interest Rate, Stated Percentage Last installment due date Promissory note maturity date Line of credit due date Debt Instrument, Name [Domain] Deferred tax liability (note 21) Deferred tax assets (note 21) Deferred revenue Deferred income taxes Depreciation expense Depreciation and amortization STOCK-BASED COMPENSATION [Abstract] STOCK-BASED COMPENSATION Share-based Payment Arrangement [Text Block] Investment due amount Net income (loss) attributable to ACM Research, Inc. per common share (note 2): Net income (loss) 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 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 Foreign corporate tax rate Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Percent Statutory U.S federal income tax rate 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] Equity Component [Domain] COMMON STOCK [Abstract] Purchase price Percentage of ordinary shares issued Investment - equity method Financial liability carried at fair value Financial Liabilities Fair Value Disclosure Intangible assets, net Finite-Lived Intangible Assets, Net PRC [Member] Loss on disposals of property, plant and equipment Gain (Loss) on Disposition of Property Plant Equipment General and administrative General and Administrative Expense [Member] Gross profit Gross Profit 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 income in net income of affiliates Condensed Consolidated Statements of Operations and Comprehensive Income [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 (Benefit) Interest or penalties Income Tax Examination, Penalties and Interest Expense Income Taxes [Abstract] Income Tax Expense (Benefit), Continuing Operations [Abstract] Cash paid for income taxes 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 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] Interest expense related to long-term borrowings incurred Interest expense 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 reserve INVENTORIES Finished goods Total inventory Inventory, Gross Work in process Inventories (note 5) Inventory [Abstract] Raw materials Interest income Long-term investments (note 14) Total TRADING SECURITIES [Abstract] Investments [Abstract] Investor [Member] 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 2021 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 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 2021 Long-Term Debt, Maturity, Remainder of Fiscal Year 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] 2023 Long-Term Debt, Maturity, Year Two Long-term Borrowings Long-term borrowings (note 12) 2024 Long-Term Debt, Maturity, Year Three Required liquidate damage value 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 (Used in) Financing Activities Cash flows from financing activities: Net Cash Provided by (Used in) Financing Activities [Abstract] Net cash provided by (used in) operating activities Net Cash Provided by (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 (Used in) Investing Activities Net income (loss) attributable to ACM Research, Inc. Net Income (Loss) Attributable to Parent Numerator [Abstract] Net Income (Loss) Attributable to Parent [Abstract] 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 Recent Accounting Pronouncements Non-cash used in financing activities: Noncash Investing and Financing Items [Abstract] Noncontrolling Interests [Member] Noncontrolling 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 expenses: Total operating expenses, net Operating Expenses Income from operations Operating Income (Loss) DESCRIPTION OF BUSINESS [Abstract] Other Long-Term Liabilities Other Noncurrent Liabilities [Table Text Block] Foreign currency translation adjustment OTHER LONG-TERM LIABILITIES [Abstract] Other receivables 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 Long-term Liabilities [Abstract] Other Liabilities, Noncurrent [Abstract] OTHER LONG-TERM LIABILITIES Other long-term liabilities (note 13) Other long-term liabilities Other income (expenses), net 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] Purchase of long-term investments Payments to Acquire Long-term Investments Repayment of investment in cash Payments for (Proceeds from) Investments Purchase of intangible assets Payments to Acquire Intangible Assets Purchase of property and equipment Payments to Acquire Property, Plant, and Equipment Plan Name [Domain] Plan Name [Axis] Prepaid expenses Proceeds from warrant exercise to common stock Proceeds from Warrant Exercises Proceeds from sale of interest in subsidiary Proceeds from long-term borrowings Proceeds from short-term borrowings Proceeds from stock option exercise to common stock Accrued warranty Net income Net income Net income Property, Plant and Equipment [Line Items] PROPERTY, PLANT AND EQUIPMENT, NET Property, Plant and Equipment Disclosure [Text Block] PROPERTY, PLANT AND EQUIPMENT, NET [Abstract] Property, Plant and Equipment Property, Plant and Equipment [Table Text Block] Long-Lived Tangible Asset [Axis] Long-Lived Tangible Asset [Domain] Property, plant and equipment, net (note 6) Total property, plant and equipment, net Total cost Property, Plant and Equipment [Abstract] Investments Real Estate Investments, Net ACCOUNTS RECEIVABLE [Abstract] Receivables Receivables, Net, Current 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 Transaction [Axis] Related Party [Axis] RELATED PARTY BALANCES AND TRANSACTIONS Related Party Transactions Disclosure [Text Block] Related Party Transaction [Domain] 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 Research and Development Expense [Member] Restricted cash Accumulated Surplus [Member] Accumulated surplus Retained Earnings (Accumulated Deficit) REVENUE FROM CONTRACTS WITH CUSTOMERS [Abstract] Revenue (note 3) Revenue REVENUE FROM CONTRACTS WITH CUSTOMERS 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 beginning of period (in dollars per share) Outstanding at end of period (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Option, Nonvested, Weighted Average Exercise Price 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] Inventory Related Party Balances and Transactions Schedule of Related Party Transactions [Table Text Block] Components of Stock-based Compensation Expense Share-based Payment Arrangement, Cost by Plan [Table Text Block] Income Tax Benefit (Expense) Schedule of Components of Income Tax Expense (Benefit) [Table Text Block] Basic and Diluted Net Income per Common Share Schedule of Earnings Per Share, Basic and Diluted [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] Short-Term Borrowings Schedule of Short-term Debt [Table Text Block] 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 Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block] Sales and Marketing Expense [Member] Sales and marketing 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) 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, end of period (in dollars per share) Outstanding, beginning 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] Share price (in dollars per share) Shares issued (in shares) Shares, Issued Ending balance (in shares) Beginning balance (in shares) Shares, Outstanding SHORT-TERM BORROWINGS Short-term Debt [Text Block] Short-term Debt [Line Items] Short-term borrowings (note 9) Short-term borrowings Short-Term Borrowings [Abstract] Short-term Debt [Abstract] Short-term lease cost SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Significant Accounting Policies [Text Block] Condensed Consolidated Balance Sheets [Abstract] Class of Stock [Axis] Statement [Table] Statement [Line Items] Condensed Consolidated Statements of Cash Flows [Abstract] Equity Components [Axis] Condensed Consolidated Statements of Changes in Stockholders' Equity [Abstract] Exercise of stock options (in shares) Exercised (in shares) Stock issued upon exercise of stock options (in shares) Shares issued (in shares) Conversion of class B common stock to Class A common stock (in shares) Stock Issued During Period, Shares, Conversion of Units Share repurchase Stock Repurchased During Period, Value Exercise of stock options Stock Issued During Period, Value, Stock Options Exercised Shares issued value Stock Issued During Period, Value, New Issues Conversion of class B common stock to Class A common stock Number of shares repurchased/surrender in exchange (in shares) Share repurchase (in shares) Number of shares repurchased/surrender in exchange (in shares) Reverse stock split Total ACM Research, Inc. stockholders' equity Stockholders' Equity Attributable to Parent COMMON STOCK Stockholders' Equity Note Disclosure [Text Block] Total stockholders' equity Beginning balance Ending balance Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest Stockholders' equity: Stockholders' equity: Subsequent Event [Member] Subsequent Event Type [Domain] Subsequent Event [Line Items] Subsequent Event Type [Axis] SUBSEQUENT EVENT [Abstract] Subsequent Event [Table] SUBSEQUENT EVENT Supplemental disclosure of cash flow information: Components of Trading Securities Cost Transportation Equipment [Member] Unrecognized tax benefits Unrecognized tax benefits that would impact effective tax rate Use of Estimates Fair value warrant amount Diluted (in shares) Weighted average shares outstanding, diluted (in shares) Effect of dilutive securities (in shares) Weighted Average Number Diluted Shares Outstanding Adjustment Basic (in shares) Weighted average shares outstanding, basic (in shares) Weighted Average Number of Shares Outstanding, Basic Weighted average common shares outstanding used in computing per share amounts (note 2): Consolidated Entities [Domain] Consolidated Entities [Axis] Customer [Axis] Maximum [Member] Minimum [Member] Customer [Domain] Product and Service [Domain] Product and Service [Axis] Statistical Measurement [Domain] Statistical Measurement [Axis] Geographical [Domain] Geographical [Axis] Subsidiaries [Member] Subsidiaries [Member] Subsidiaries [Member] Mainland China [Member] Cover [Abstract] Document Information [Table] Document Information [Line Items] Document Type Document Quarterly Report Document Transition Report Entity Interactive Data Current Amendment 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 Current Reporting Status Entity Shell Company Entity Filer Category Entity Small Business Entity Emerging Growth Company 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 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 Conversion of warrants to common stock. Warrant conversion to common stock Warrant conversion to common stock Amount of cash outflow for property and acquisition of land-use-right; excludes purchases of land as inventory or as investments. Pre-payment for land-use-right and property Prepayment for land-use-right and property 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 Cashless exercise of stock options. Cashless Exercise of Stock Options Cashless exercise of stock options 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 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: LAND USE RIGHT, NET [Abstract] The entire disclosure for land use rights, net. Land Use Rights, Net [Text Block] LAND USE RIGHT, NET Supplemental Cash Flow Information Related to Operating Leases [Abstract] Supplemental cash flow information related to operating leases [Abstract] Annual Amortization of Land use Right [Abstract] Land use Right [Abstract] Amount of accumulated amortization on land use right. Land use Right, Accumulated Amortization Less: Accumulated amortization 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) 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 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 reminder of fiscal year of following current fiscal year. Amortization Of Land Use Right Due Remainder Of Fiscal Year 2021 Amount of amortization of ground lease. Amortization of Ground Lease Amortization 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 2023 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 2024 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 2025 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 2022 Entity owned or controlled by another entity. Shengwei Research (Shanghai), Inc. [Member] Shangwei Research (Shanghai), Inc. [Member] Shengwei Research (Shanghai), Inc. [Member] Entity owned or controlled by another entity. ACM Research (CA), Inc. [Member] Entity owned or controlled by another entity. CleanChip Technologies Limited [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] Business Description [Abstract] Description of Business [Abstract] 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 The percentage of ownership of common stock or equity participation of subsidiaries. Subsidiaries Ownership Percentage Effective interest held as at Information of place and date of incorporation of an entity. Name of Date of Incorporation Date and place of Incorporation Entity owned or controlled by another entity. ACM Research (Shanghai), Inc. [Member] ACM Shanghai [Member] ACM Research (Shanghai), Inc. [Member] Entity owned or controlled by another entity. ACM Research (Wuxi), Inc. [Member] ACM Research (Wuxi), Inc. [Member] Name of entity owned or controlled by another entity. Name of Subsidiary Name of subsidiaries Represents first portion of investors. First Tranche Investors [Member] Represents Second portion of investors. Second Tranche Investors [Member] Term to complete listing of shares of ACM Shanghai on the Shanghai Stock Exchange's new Sci-Tech innovation board known as Star Market. Term to complete listing of shares 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 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 (loss) 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) 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 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 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) 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] The entire disclosure for long-term investment. long-term investment [Text Block] LONG TERM INVESTMENT A container table for all schedule of long-term investments. Long-Term Investments [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] Classification of Investments [Abstract] Classification of Investments [Abstract] 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 principal material supplier. Ninebell Company Limited [Member] Ninebell [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 components suppliers. Shengyi Semiconductor Technology Company Limited [Member] Shengyi [Member] The amount of investment in partnership. Investment in Partnership Investment in partnership The percentage ownership in Partnership's total subscribed capital. Ownership Percentage in Partnership Ownership percentage in partnership Tabular disclosure of annual amortization of land use right. Annual Amortization of Land Use Right [Table Text Block] Annual Amortization of Land Use Right Tabular disclosure of land use rights, net. Land Use Rights, Net [Table Text Block] Land Use Rights The entire disclosure for other noncurrent assets. Other Assets, Non-Current Disclosure [Text Block] OTHER LONG-TERM ASSETS 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 security deposit for land use right paid in advance. Security Deposit for Land Use Right Security deposit for land use right 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 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 Tabular disclosure of long-term investment. Long-Term Investment [Table Text Block] Components of Long-Term Investment Disclosure of accounting policy for COVID-19 assessment. COVID-19 Assessment [Policy Text Block] COVID-19 Assessment 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 Concentration of Credit Risk [Abstract] Number of major customers who contributes 10% or more of entity's total revenue. Number of Major Customers Number of major customers Information by number of customers. Three customers [Member] Three Customers [Member] Number of days headquarters were closed beyond the normal Lunar New Year Holiday in accordance with Shanghai government restrictions related to the outbreak. Number of days headquarters closed Refers to the number of counties in which health officers issued shelter in place orders. Number of San Francisco Bay Area counties 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 (note 21) All taxes including value-added taxes, corporate income tax, personal income taxes, urban maintenance and construction taxes, education surcharges, stamp taxes, and vehicle and shipping taxes. Annual Total Taxes Annual total taxes Period after the land use right is obtained. Land Use Rights Period Land use rights period A putative class action lawsuit filed against current executive officers. Number of Executive Officers Against Lawsuit Filed Number of executive officers against lawsuit filed Number of outstanding legal proceeding regarding securities class action. Number of Outstanding Legal Proceedings Number of outstanding legal proceedings Name of related party. Shengyi Semiconductor Technology Co., Ltd [Member] Shengyi Semiconductor Technology 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 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 fourth 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 Four and After 2025 and onwards Name of the lender. China Merchants Bank [Member] China Merchants Bank [Member] Name of the lender. Bank of China [Member] Number of installments for loan repayable to bank. Number of Installments for Loan Repayable Number of installments for loan repayable 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 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 Name of related party. Shengxin (Shanghai) Management Consulting Limited Partnership [Member] SMC [Member] Name of the class or type of 2020 warrants. Shengxin (Shanghai) Management Consulting Limited Partnership 2020 Warrants [Member] 2020 Warrants [Member] A promissory note between parent organization and subsidiary. Intercompany Note [Member] Intercompany Note [Member] Number of agreements relating to outstanding obligations among parent and subsidiaries. Number of Agreements Number of agreement The amount of warrants issued for settlement of financial liability. Issuance of warrant for settlement of financial liability 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 Cash delivered by related party as of the close of business. Cash Delivered as of Close of Business Payment for investment 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 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 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] Percentage of foreign tax rate. Foreign corporate tax rate The number of subsidiaries liable for PRC corporate income taxes rate. Number of Subsidiaries Number of subsidiaries Effective period for entities certified as "advanced and new technology enterprises" to receive preferential income tax rate. Effective period of preferential income tax rate Effective period of preferential income tax rate 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 Total number of shares cancelled after taking ownership. Number of Shares Cancelled Number of votes entitled for each share of common stock. Voting Rights per Share Number of votes for each share entitled REDEEMABLE NON-CONTROLLING INTERESTS [Abstract] The entire disclosure for a redeemable non-controlling interests. Redeemable Non-Controlling Interests [Text Block] REDEEMABLE NON-CONTROLLING INTERESTS 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 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 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 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 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 10 [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 1 [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 21 [Member] Line of Credit Due on May 26, 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 23 [Member] Line of Credit Due on February 2 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 2 [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 24 [Member] Line of Credit Due on February 2, 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 6 [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 5 [Member] Line of Credit Due on September 30, 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 13 [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 15 [Member] Line of Credit Due on February 1, 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 11 [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 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 12 [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 4 [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 3 [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 14 [Member] Line of Credit Due on August 25, 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 26 [Member] Line of Credit Due on June 15, 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 22 [Member] Line of Credit Due on February 2, 2022 [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] 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. Wet Cleaning And Other Front End Processing Tools [Member] Wet Cleaning and Other Front-end Processing Tools [Member] 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. Advanced Packaging (exclude ECP), Services & Spares [Member] Advanced Packaging (Excluding ECP), Services & Spares [Member] Disaggregated Revenue Information [Abstract] Represents other regions. Oher Regions [Member] Change in Redeemable Noncontrolling Interests [Abstract] Change in Redeemable Non-controlling Interests [Abstract] Fair value of option grants in period, valuation model assumptions based on market condition. Market Based [Member] Fair value of option grants in period, valuation model assumptions based on service period. Service Period Based Approach [Member] Service Period Based [Member] Share-based payment arrangement granting right, subject to vesting and other restrictions, to purchase or sell certain number of shares at predetermined price for specified period of time. Employee and Non-employee Stock Option [Member] The entire disclosure for trading securities. Trading Securities [Text Block] TRADING SECURITIES 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] 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 Total fund of the Partnership which was contributed by limited partners. Capital Fund of Limited Partnership Total capital fund of limited partnership Subsidies to backside clean-YMTC national project, commenced in 2020. Subsidies to Backside Clean YMTC National Project [Member] Subsidies to Backside Clean-YMTC National Project, Commenced in 2020 [Member] 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] 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] Other items related to other long-term liabilities. Other [Member] Other [Member] Subsidies to polytetrafluoroethylene, commenced in 2018. Subsidies to Polytetrafluoroethylene [Member] Subsidies to Polytetrafluoroethylene, Commenced in 2018 [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] 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)