Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 92,203	$ 58,261
Restricted cash	0	59,598
Trading securities (note 11)	23,888	0
Accounts receivable, less allowance for doubtful accounts of $0 as of September 30, 2020 and December 31, 2019 (note 3)	59,796	31,091
Other receivables	6,177	2,603
Inventories (note 4)	64,182	44,796
Prepaid expenses	5,531	2,047
Total current assets	251,777	198,396
Property, plant and equipment, net (note 5)	5,974	3,619
Land use right, net (note 2)	9,284	0
Operating lease right-of-use assets, net (note 8)	4,568	3,887
Intangible assets, net	335	344
Deferred tax assets (note 17)	10,093	5,331
Long-term investments (note 10)	6,580	5,934
Other long-term assets	8,008	192
Total assets	296,619	217,703
Current liabilities:
Short-term borrowings (note 6)	28,327	13,753
Accounts payable	35,639	13,262
Advances from customers	8,011	9,129
Income taxes payable	3,589	3,129
Other payables and accrued expenses (note 7)	18,494	12,874
Current portion of operating lease liability (note 8)	1,388	1,355
Deferred revenue	819	0
Total current liabilities	96,267	53,502
Long-term operating lease liability (note 8)	3,180	2,532
Other long-term liabilities (note 9)	6,454	4,186
Total liabilities	105,901	60,220
Commitments and contingencies (note 18)
Redeemable non-controlling interests (note 15)	0	60,162
Stockholders' equity:
Additional paid in capital	100,145	83,487
Accumulated surplus	25,758	15,507
Accumulated other comprehensive income (loss)	1,037	(1,675)
Total ACM Research, Inc. stockholders' equity	126,942	97,321
Non-controlling interests	63,776	0
Total stockholders' equity	190,718	97,321
Total liabilities, redeemable non-controlling interests, and stockholders' equity	296,619	217,703
Class A Common Stock [Member]
Stockholders' equity:
Common stock	2	2
Class B Common Stock [Member]
Stockholders' equity:
Common stock	$ 0	$ 0