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Unaudited Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Cash flows from operating activities    
Net loss $ (51,016) $ (48,438)
Adjustments to reconcile net loss to net cash used in operating activities:    
Allowance for credit losses (15) (3)
Inventory write-down 188 27
Depreciation and amortization expenses 3,944 3,458
Amortization of deferred income (1,393) (1,331)
Share-based compensation 13,524 15,800
Loss from fair value changes of equity investment with readily determinable fair value 0 1,912
Loss on disposal of property and equipment 18 0
Noncash lease expenses 1,810 2,466
Foreign currency remeasurement impact (14,837) (651)
Changes in operating assets and liabilities:    
Accounts receivable 53,268 8,737
Notes receivable 4,410 (6,885)
Inventories (11,208) (13,198)
Prepayments and other current assets 1,518 (1,601)
Other non-current assets (78) 1,401
Accounts payable 4,261 2,720
Other current liabilities (17,638) (23,275)
Operating lease liabilities (1,061) (2,827)
Deferred income 2,353 (11)
Other non-current liabilities 40 0
Net cash used in operating activities (11,912) (61,699)
Cash flows from investing activities    
Proceeds from maturity of short-term investment 0 330,000
Purchases of property and equipment (1,195) (1,534)
Proceeds from the sale of property and equipment 2 0
Acquisition of intangible assets (21,095) (2,333)
Net cash (used in) provided by investing activities (22,288) 326,133
Cash flows from financing activities    
Proceeds from short-term debt 112,510 101,890
Repayment of short-term bank borrowings (105,500) (60,904)
Proceeds from exercises of stock options 833 3,009
Payments of public offering costs 0 (854)
Employee taxes paid related to net share settlement of equity awards (2,270) 0
Net cash provided by financing activities 5,573 43,141
Effect of foreign exchange rate changes on cash, cash equivalents and restricted cash 371 20
Net (decrease) increase in cash, cash equivalents and restricted cash (28,256) 307,595
Cash, cash equivalents and restricted cash - beginning of period 780,689 550,781
Cash, cash equivalents and restricted cash - end of period 752,433 858,376
Supplemental disclosure on non-cash investing and financing activities    
Payables for purchase of property and equipment 629 2,645
Payables for acquisition of intangible assets 895 2,075
Payables for public offering costs 168 168
Receivable from sales of equity investments 0 1,203
Receivables for stock option exercise under equity incentive plans 0 794
Supplemental disclosure of cash flow information    
Cash paid for interest $ 1,399 $ 1,101