Unaudited Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023
Cash flows from operating activities
Net loss	$ (175,419)	$ (239,191)
Adjustments to reconcile net loss to net cash used in operating activities:
Allowance for credit losses	(3)	1
Inventory write-down	814	746
Depreciation and amortization expenses	8,824	6,570
Amortization of deferred income	(2,518)	(2,547)
Share-based compensation	53,413	59,164
Loss from fair value changes of equity investment with readily determinable fair value	6,067	1,965
Losses on disposal of property and equipment	451	139
Gain on disposal of land use right	0	(408)
Noncash lease expenses	6,104	6,630
Gain on sale of intellectual property	0	(10,000)
Debt issuance costs	700	0
Foreign currency remeasurement impact	(8,281)	26,315
Changes in operating assets and liabilities:
Accounts receivable	9,712	(2,823)
Notes receivable	(12,901)	(15,563)
Inventories	4,403	(14,408)
Prepayments and other current assets	(10,767)	5,126
Long-term deposits	234	140
Value added tax recoverable	(1,223)	0
Accounts payable	6,545	(9,494)
Other current liabilities	(36,854)	227
Operating lease liabilities	(6,853)	(5,794)
Deferred income	(1,548)	9,619
Other non-current liabilities	0	325
Net cash used in operating activities	(159,100)	(183,261)
Cash flows from investing activities
Purchases of short-term investments	0	(134,000)
Proceeds from maturity of short-term investment	16,300	102,400
Purchases of property and equipment	(3,057)	(6,990)
Proceeds from the sale of property and equipment	29	122
Acquisition of intangible assets	(40,711)	(658)
Proceeds from sale of intellectual property	0	10,000
Proceeds from disposal of land use right	0	3,893
Net cash used in investing activities	(27,439)	(25,233)
Cash flows from financing activities
Proceeds from short-term debt	111,738	0
Repayment of short-term bank borrowings	(282)	0
Payments of debt issuance costs	(700)	0
Proceeds from exercises of stock options	1,321	1,899
Taxes paid related to settlement of equity awards	0	(8,725)
Net cash provided by (used in) financing activities	112,077	(6,826)
Effect of foreign exchange rate changes on cash, cash equivalents and restricted cash	402	(3,355)
Net decrease in cash, cash equivalents and restricted cash	(74,060)	(218,675)
Cash, cash equivalents and restricted cash - beginning of period	791,264	1,009,273
Cash, cash equivalents and restricted cash - end of period	717,204	790,598
Supplemental disclosure on non-cash investing and financing activities
Payables for purchase of property and equipment	2,612	2,625
Payables for acquisition of intangible assets	11,358	98
Payables for treasury stock	0	31
Right-of-use asset acquired under operating leases	3,945	3,296
Receivables for stock option exercise under equity incentive plans	1,593	0
Supplemental disclosure of cash flow information
Cash paid for interest	$ 1,169	$ 0