Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2026	Jun. 30, 2025
Cash flows from operating activities:
Net income	$ 148,485	$ 61,283
Adjustments to reconcile net income to net cash used in operating activities:
Non-cash operating lease cost	2,384	2,081
Depreciation and amortization	11,766	6,356
Income from equity method investments	(22,846)	(2,725)
Unrealized gain on short-term investments	(68,186)	(1,648)
Inventory provision	12,019	5,625
Provision for credit losses	3,710	1,435
Deferred income taxes	4,186	(7,451)
Stock-based compensation	12,204	19,587
Dividends from unconsolidated affiliates	2,821	0
Others	0	1,086
Net changes in operating assets and liabilities:
Accounts receivable	(4,369)	(44,508)
Other receivables	(8,862)	(848)
Inventories	(69,882)	(52,946)
Advances to related parties	2,337	342
Prepaid expenses and other current assets	(12,035)	(6,433)
Other long-term assets	(1,143)	0
Related parties accounts payable	(2,261)	3,694
Accounts payable	(10,730)	7,743
Advances from customers	(25,915)	(24,357)
Deferred revenue	(1,480)	5,123
Income taxes payable	(19,849)	(12,585)
FIN-48 payable	1,189	1,908
Other payables and accrued expenses	13,619	336
Operating lease liabilities	(2,537)	(2,027)
Other long-term liabilities	(521)	(690)
Net cash used in operating activities	(35,896)	(39,619)
Cash flows from investing activities:
Purchases of property and equipment	(87,311)	(31,458)
Purchase of intangible assets	(476)	(784)
Purchase of time deposits	(25,000)	(27,000)
Proceeds from redemption and maturity of time deposits	38,005	27,261
Proceeds from sale of short-term investments	0	686
Purchase of long-term investments	(4,698)	0
Net cash used in investing activities	(79,480)	(31,295)
Cash flows from financing activities:
Proceeds from short-term borrowings	91,906	45,073
Repayments of short-term borrowings	(61,380)	(25,175)
Proceeds from long-term borrowings	75,525	89,485
Repayments of long-term borrowings	(62,863)	(15,246)
Capital contribution by non-controlling shareholder	0	242
Proceeds from exercise of stock options	30,778	23,582
Gross proceeds from sales of ACM Shanghai shares	110,243	0
Repurchase of ACM Shanghai shares	0	(6,988)
Proceeds from issuance of ACM Research shares, net of issuance costs	148,389	0
Net cash provided by financing activities	332,598	110,973
Effect of exchange rate changes on cash, cash equivalents and restricted cash	7,403	1,517
Net increase in cash, cash equivalents and restricted cash	224,625	41,576
Cash, cash equivalents and restricted cash at beginning of period	765,962	411,310
Cash, cash equivalents and restricted cash at end of period	990,587	452,886
Supplemental disclosure of cash flow information:
Interest paid	3,992	3,315
Cash paid for income taxes	30,541	23,399
Reconciliation of cash, cash equivalents and restricted cash in consolidated statements of cash flows:
Cash and cash equivalents	969,229	442,088
Restricted cash	21,358	10,798
Cash, cash equivalents and restricted cash	990,587	452,886
Non-cash investing activities:
Transfer of prepayment for property to property, plant, and equipment	125	21
Transfer from other non-current assets to long term investment	0	16,737
Transfer from inventories to property, plant and equipment	0	589
Purchases of property, plant and equipment through other payables and accrued expenses	10,529	24,055
Non-cash financing activities:
Cashless exercise of stock options	0	179
Deferred offering costs included in prepaid expenses and other current assets	$ 2,403	$ 0