Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		8 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024	Dec. 31, 2024
Cash flows from operating activities:
Net income	$ 36,270	$ 31,399	$ 61,283	$ 53,491
Adjustments to reconcile net income from operations to net cash (used in) provided by operating activities
Non-cash operating lease cost			2,081	2,004
Depreciation and amortization			6,356	4,684
Realized gain on short-term investments			0	(273)
(Income) loss from equity method investments	(1,773)	695	(2,725)	1,215
Unrealized (gain) loss on short-term investments	(2,730)	(1,031)	(1,648)	1,564
Inventory provision			5,625	3,009
Provision for credit losses			1,435	1,954
Deferred income taxes			(7,451)	(720)
Stock-based compensation			19,587	28,911
Dividends from unconsolidated affiliates			0	600
Others			1,086	(1)
Net changes in operating assets and liabilities:
Accounts receivable			(44,508)	(14,842)
Other receivables			(848)	(11,686)
Inventories			(52,946)	(64,889)
Advances to related parties (note 13)			342	(324)
Prepaid expenses and other current assets			(6,433)	1,164
Related parties accounts payable (note 13)			3,694	6,605
Accounts payable			7,743	2,400
Advances from customers			(24,357)	26,333
Deferred revenue			5,123	1,592
Income taxes payable			(12,585)	4,755
FIN-48 payable			1,908	(56)
Other payables and accrued expenses			336	6,824
Operating lease liabilities			(2,027)	(2,004)
Other long-term liabilities			(690)	(368)
Net cash (used in) provided by operating activities			(39,619)	51,942
Cash flows from investing activities:
Purchase of property and equipment			(31,458)	(38,512)
Purchase of intangible assets			(784)	(1,152)
Purchase of short-term investments (note 12)			0	(1,403)
Purchase of time deposits			(27,000)	(58,090)
Proceeds from redemption and maturity of time deposits			27,261	138,412
Refund of deposit for land use right			686	0
Purchase of long-term investments (note 11)			0	(7,366)
Net cash (used in) provided by investing activities			(31,295)	31,889
Cash flows from financing activities:
Proceeds from short-term borrowings			45,073	23,936
Repayments of short-term borrowings			(25,175)	(1,197)
Proceeds from long-term borrowings			89,485	32,277
Repayments of long-term borrowings			(15,246)	(3,202)
Capital contribution by non-controlling shareholder			242	0
Repurchase of ACM Shanghai's shares			(6,988)	0
Proceeds from exercise of stock options			23,582	6,437
Net cash provided by financing activities			110,973	58,251
Effect of exchange rate changes on cash, cash equivalents and restricted cash			1,517	(343)
Net increase in cash, cash equivalents and restricted cash			41,576	141,739
Cash, cash equivalents and restricted cash at beginning of period			411,310	183,173
Cash, cash equivalents and restricted cash at end of period	452,886	324,912	452,886	324,912	$ 411,310
Supplemental disclosure of cash flow information:
Interest paid, net of capitalized interest			3,315	1,715
Cash paid for income taxes			23,399	9,109
Reconciliation of cash, cash equivalents and restricted cash in consolidated statements of cash flows:
Cash and cash equivalents	442,088	324,031	442,088	324,031	407,445
Restricted cash	10,798	881	10,798	881	3,865
Cash, cash equivalents and restricted cash	$ 452,886	$ 324,912	452,886	324,912	$ 411,310
Non-cash financing activities:
Cashless exercise of stock options			179	262
Non-cash investing activities:
Transfer of prepayment for property to property, plant, and equipment			21	5,490
Proceeds from sale of short-term investments included in other receivables			0	3,167
Transfer from other non-current assets to long term investment			16,737	0
Transfer from inventories to property, plant and equipment			589	0
Purchases of property, plant and equipment through other payable			$ 24,055	$ 33,479