Unaudited Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Cash flows from operating activities
Net loss	$ (239,191)	$ (381,517)
Adjustments to reconcile net loss to net cash used in operating activities:
Allowance for credit loss (gain)	1	(3)
Inventory write-down	746	480
Depreciation and amortization expenses	6,570	6,100
Amortization of deferred income	(2,547)	(2,041)
Share-based compensation	59,164	45,742
Share of loss from equity method investment	0	221
Loss from fair value changes of equity investment with readily determinable fair value	1,965	12,067
Loss (gain) on disposal of property and equipment	139	(11)
Gain on disposal of land use right	(408)	0
Noncash lease expenses	6,630	5,820
Gain from sale of intellectual property	(10,000)	0
Foreign currency remeasurement loss	26,315	73,052
Changes in operating assets and liabilities:
Accounts receivable	(2,823)	16,483
Notes receivable	(15,563)	(3,861)
Inventories	(14,408)	(13,235)
Prepayments and other current assets	5,126	(5,860)
Long-term deposits	140	(459)
Value added tax recoverable	0	21,432
Accounts payable	(9,494)	(28,850)
Other current liabilities	227	1,628
Operating lease liabilities	(5,794)	(6,008)
Deferred income	9,619	470
Other non-current liabilities	325	0
Net cash used in operating activities	(183,261)	(258,350)
Cash flows from investing activities
Purchases of short-term investments	(134,000)	(260,274)
Proceeds from maturity of short-term investment	102,400	705,274
Purchase of property and equipment	(6,990)	(20,172)
Proceeds from the sale of property and equipment	122	0
Purchase of intangible assets	(658)	(439)
Proceeds from sale of intellectual property	10,000	0
Proceeds from disposal of land use right	3,893	0
Net cash (used in) provided by investing activities	(25,233)	424,389
Cash flows from financing activities
Proceeds from exercises of stock options	1,899	5,640
Taxes paid related to settlement of equity awards	(8,725)	(7,171)
Net cash used in financing activities	(6,826)	(1,531)
Effect of foreign exchange rate changes on cash, cash equivalents and restricted cash	(3,355)	(9,132)
Net (decrease) increase in cash, cash equivalents and restricted cash	(218,675)	155,376
Cash, cash equivalents and restricted cash - beginning of period	1,009,273	964,903
Cash, cash equivalents and restricted cash - end of period	790,598	1,120,279
Supplemental disclosure on non-cash investing and financing activities
Payables for purchase of property and equipment	2,625	3,234
Payables for intangible assets	98	32
Payables for treasury stock	31	32
Receivables for stock option exercise under equity incentive plans	0	31
Right-of-use asset acquired under operating leases	3,296	12,861
Supplemental disclosure of cash flow information
Cash and cash equivalents	788,806	1,119,476
Restricted cash, non-current	1,792	803
Total cash and cash equivalents and restricted cash	$ 790,598	$ 1,120,279