Unaudited Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2026	Sep. 30, 2025
Cash flows from operating activities
Net loss	$ (147,977)	$ (125,128)
Adjustments to reconcile net loss to net cash used in operating activities:
Allowance for credit losses	(12)	0
Inventory write-down	13,615	919
Depreciation and amortization expenses	12,528	11,094
Amortization of deferred income	(4,322)	(3,991)
Share-based compensation	36,464	49,696
Loss from fair value changes of equity investment with readily determinable fair value	0	1,912
Losses on disposal of property and equipment	48	235
Noncash lease expenses	4,886	7,249
Debt issuance costs	0	194
Foreign currency remeasurement impact	(40,430)	(9,909)
Changes in operating assets and liabilities:
Accounts receivable	43,937	726
Notes receivable	2,535	(15,223)
Inventories	(20,162)	(28,112)
Prepayments and other current assets	(6,548)	(1,789)
Deferred tax assets	(2,943)	0
Other non-current assets	389	599
Accounts payable	(3,216)	(426)
Other current liabilities	(19,912)	(6,769)
Operating lease liabilities	(4,996)	(6,405)
Deferred income	2,360	361
Other non-current liabilities	570	0
Net cash used in operating activities	(133,186)	(124,767)
Cash flows from investing activities
Proceeds from maturity of short-term investment	0	330,000
Proceeds from the sale of equity investment	0	1,203
Purchases of property and equipment	(3,451)	(7,424)
Proceeds from the sale of property and equipment	270	85
Acquisition of intangible assets	(33,205)	(4,702)
Net cash (used in) provided by investing activities	(36,386)	319,162
Cash flows from financing activities
Proceeds from short-term debt	225,674	185,564
Repayment of short-term bank borrowings	(187,173)	(116,941)
Payments of debt issuance costs	0	(194)
Proceeds from exercises of stock options	4,530	13,426
Payments of public offering costs	0	(854)
Employee taxes paid related to net share settlement of equity awards	(4,701)	(8,218)
Net cash provided by financing activities	38,330	72,783
Effect of foreign exchange rate changes on cash, cash equivalents and restricted cash	1,330	311
Net (decrease) increase in cash, cash equivalents and restricted cash	(129,912)	267,489
Cash, cash equivalents and restricted cash - beginning of period	780,689	550,781
Cash, cash equivalents and restricted cash - end of period	650,777	818,270
Supplemental disclosure on non-cash investing and financing activities
Payables for purchase of property and equipment	895	468
Payables for acquisition of intangible assets	196	1,158
Payables for public offering costs	168	168
Receivables for stock option exercise under equity incentive plans	22	239
Supplemental disclosure of cash flow information
Cash paid for interest	4,339	3,610
Cash paid for income tax	$ 1,190	$ 0