Unaudited Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Cash flows from operating activities
Net loss	$ (48,438)	$ (53,471)
Adjustments to reconcile net loss to net cash used in operating activities:
Allowance for credit losses	(3)	1
Inventory write-down	27	37
Depreciation and amortization expenses	3,458	3,012
Amortization of deferred income	(1,331)	(840)
Share-based compensation	15,800	17,980
Loss (gain) from fair value changes of equity investment with readily determinable fair value	1,912	(4,889)
Losses on disposal of property and equipment	0	407
Noncash lease expenses	2,466	2,069
Debt issuance costs	0	700
Foreign currency remeasurement impact	(651)	2,068
Changes in operating assets and liabilities:
Accounts receivable	8,737	(1,328)
Notes receivable	(6,885)	(9,239)
Inventories	(13,198)	6,818
Prepayments and other current assets	(1,601)	(1,253)
Other non-current assets	1,401	(271)
Accounts payable	2,720	(13,370)
Other current liabilities	(23,275)	(34,204)
Operating lease liabilities	(2,827)	(2,783)
Deferred income	(11)	(1,550)
Net cash used in operating activities	(61,699)	(90,106)
Cash flows from investing activities
Proceeds from maturity of short-term investment	330,000	16,300
Purchases of property and equipment	(1,534)	(974)
Acquisition of intangible assets	(2,333)	(12,034)
Net cash provided by investing activities	326,133	3,292
Cash flows from financing activities
Proceeds from short-term debt	101,890	48,248
Repayment of short-term bank borrowings	(60,904)	0
Payments of debt issuance costs	0	(700)
Proceeds from exercises of stock options	3,009	0
Payments of public offering costs	(854)	0
Net cash provided by financing activities	43,141	47,548
Effect of foreign exchange rate changes on cash, cash equivalents and restricted cash	20	(104)
Net increase (decrease) in cash, cash equivalents and restricted cash	307,595	(39,370)
Cash, cash equivalents and restricted cash - beginning of period	550,781	791,264
Cash, cash equivalents and restricted cash - end of period	858,376	751,894
Supplemental disclosure on non-cash investing and financing activities
Payables for purchase of property and equipment	2,645	2,481
Payables for acquisition of intangible assets	2,075	78
Payables for public offering costs	168	0
Right-of-use asset acquired under operating leases	0	2,395
Receivable from sales of equity investments	1,203	0
Receivables for stock option exercise under equity incentive plans	794	0
Supplemental disclosure of cash flow information
Cash paid for interest	$ 1,101	$ 45