Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 563,067	$ 71,766
Trading securities (note 16)	29,498	28,239
Accounts receivable, less allowance for doubtful accounts of $0 as of December 31, 2021 and December 31, 2020 (note 4)	105,553	56,441
Income tax recoverable	1,082	0
Other receivables	18,979	9,679
Inventories (note 5)	218,116	88,639
Prepaid expenses	16,639	5,892
Total current assets	952,934	260,656
Property, plant and equipment, net (note 6)	14,042	8,192
Land use right, net (note 7)	9,667	9,646
Operating lease right-of-use assets, net (note 11)	4,182	4,297
Intangible assets, net	477	554
Deferred tax assets (note 21)	13,166	11,076
Long-term investments (note 14)	12,694	6,340
Other long-term assets (note 8)	45,017	40,496
Total assets	1,052,179	341,257
Current liabilities:
Short-term borrowings (note 9)	9,591	26,147
Current portion of long-term borrowings (note 12)	2,410	1,591
Accounts payable	101,350	35,603
Advances from customers	52,824	17,888
Deferred revenue	3,180	1,343
Income taxes payable (note 21)	254	31
FIN-48 payable (note 20)	2,282	83
Other payables and accrued expenses (note 10)	31,735	18,805
Current portion of operating lease liability (note 11)	2,313	1,417
Total current liabilities	205,939	102,908
Long-term borrowings (note 12)	22,957	17,979
Long-term operating lease liability (note 11)	1,869	2,880
Deferred tax liability (note 21)	1,302	1,286
Other long-term liabilities (note 13)	8,447	8,034
Total liabilities	240,514	133,087
Commitments and contingencies (note 23)
Stockholders' equity:
Additional paid in capital	595,049	102,004
Accumulated surplus	72,044	34,287
Accumulated other comprehensive income	9,109	4,857
Total ACM Research, Inc. stockholders' equity	676,204	141,150
Non-controlling interests	135,461	67,020
Total stockholders' equity	811,665	208,170
Total liabilities and stockholders' equity	1,052,179	341,257
Class A Common Stock [Member]
Stockholders' equity:
Common stock	2	2
Class B Common Stock [Member]
Stockholders' equity:
Common stock	$ 0	$ 0