ACM Research (ACMR) 10-K/A 29 Apr 22 2021 FY Annual report (amended) Financial data

Document and Entity Information

Document and Entity Information - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Apr. 22, 2022	Jun. 30, 2021
Entity Listings [Line Items]
Document Type	10-K/A
Amendment Flag	false
Document Period End Date	Dec. 31, 2021
Current Fiscal Year End Date	--12-31
Document Transition Report	false
Entity Registrant Name	ACM Research, Inc.
Entity Incorporation, State or Country Code	CA
Entity File Number	001-38273
Entity Tax Identification Number	94-3290283
Entity Address, Address Line One	42307 Osgood Road
Entity Address, Address Line Two	Suite I
Entity Address, City or Town	Fremont
Entity Address, State or Province	CA
Entity Address, Postal Zip Code	94539
City Area Code	510
Local Phone Number	445-3700
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Filer Category	Large Accelerated Filer
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Small Business	false
Entity Public Float			$ 1,980.6
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	FY
Entity Central Index Key	0001680062
Document Annual Report	true
ICFR Auditor Attestation Flag	true
Auditor Name	BDO China Shu Lun Pan Certified Public Accountants LLP
Auditor Location	Shenzhen, China
Auditor Firm ID	1818
Title of 12(b) Security	Class A Common Stock, $0.0001 par value
Trading Symbol	ACMR
Security Exchange Name	NASDAQ
Class A Common Stock [Member]
Entity Listings [Line Items]
Entity Common Stock, Shares Outstanding		54,035,280
Class B Common Stock [Member]
Entity Listings [Line Items]
Entity Common Stock, Shares Outstanding		5,086,812