Unaudited Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024
Cash flows from operating activities
Net loss	$ (89,165)	$ (133,748)
Adjustments to reconcile net loss to net cash used in operating activities:
Allowance for credit losses	1	3
Inventory write-down	294	756
Depreciation and amortization expenses	7,193	5,953
Amortization of deferred income	(2,661)	(1,679)
Share-based compensation	32,773	36,618
Loss from fair value changes of equity investment with readily determinable fair value	1,912	5,147
Losses on disposal of property and equipment	211	450
Noncash lease expenses	5,377	4,141
Debt issuance costs	104	700
Foreign currency remeasurement impact	(3,488)	6,176
Changes in operating assets and liabilities:
Accounts receivable	(2,945)	(10,842)
Notes receivable	(6,611)	(2,013)
Inventories	(22,096)	2,037
Prepayments and other current assets	854	2,612
Other non-current assets	51	(232)
Accounts payable	6,474	(6,117)
Other current liabilities	(15,948)	(35,607)
Operating lease liabilities	(5,418)	(5,086)
Deferred income	365	(1,548)
Net cash used in operating activities	(92,723)	(132,279)
Cash flows from investing activities
Proceeds from maturity of short-term investment	330,000	16,300
Proceeds from the sale of equity investment	1,203	0
Purchases of property and equipment	(4,419)	(1,715)
Proceeds from the sale of property and equipment	48	29
Acquisition of intangible assets	(3,621)	(12,168)
Net cash provided by investing activities	323,211	2,446
Cash flows from financing activities
Proceeds from short-term debt	124,349	70,526
Repayment of short-term bank borrowings	(82,818)	0
Payments of debt issuance costs	(104)	(700)
Proceeds from exercises of stock options	11,444	44
Payments of public offering costs	(854)	0
Taxes paid related to settlement of equity awards	(27)	0
Net cash provided by financing activities	51,990	69,870
Effect of foreign exchange rate changes on cash, cash equivalents and restricted cash	125	(137)
Net increase (decrease) in cash, cash equivalents and restricted cash	282,603	(60,100)
Cash, cash equivalents and restricted cash - beginning of period	550,781	791,264
Cash, cash equivalents and restricted cash - end of period	833,384	731,164
Supplemental disclosure on non-cash investing and financing activities
Payables for purchase of property and equipment	2,498	2,391
Payables for acquisition of intangible assets	2,419	32,525
Payables for public offering costs	168	0
Right-of-use asset acquired under operating leases	0	2,389
Receivables for stock option exercise under equity incentive plans	77	0
Supplemental disclosure of cash flow information
Cash paid for interest	$ 2,301	$ 496