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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Cash flows from operating activities:      
Net loss $ (60,315) $ (146,175) $ (175,424)
Adjustments to reconcile net loss to net cash generated from operating activities:      
Share-based compensation 65,216 69,019 66,089
Depreciation and amortization of property, equipment and software 2,449 3,443 3,369
Amortization of right-of-use assets 4,100 4,766 6,981
Allowance for doubtful receivables / allowance for credit losses 1,595 288 1,030
Inventory write-downs 3,298 4,067 1,806
Loss/(gain) on disposal of property, equipment and software (221) (219) 365
Loss/(gain) on foreign currency exchange rates (669) (2,441) 618
Investment loss/ (gain) (697) 2,167  
Fair value change on short-term and long-term investments 76 (7,449) 833
Impairment loss of long-term investments 15,537    
Changes in operating assets and liabilities:      
Accounts receivable 1,046 20,241 (23,430)
Notes receivable (2,284) (1,374) 7,733
Inventories 9,217 13,135 (22,121)
Prepayments and other current assets (1,251) 8,893 (13,134)
Other non-current assets 290 639 (89)
Accounts payable 1,982 (2,617) (10,947)
Advance from customers 4,143 (3,455) 4,010
Deferred revenue 93 (2,898) 5,938
Income tax payable 689   (159)
Accruals and other payables (1,372) (24,280) 19,109
Lease liabilities (3,366) (4,924) (7,164)
Other non-current liability (3,113) (1,480) 8,484
Net cash (used in)/generated from operating activities 36,443 (70,654) (126,103)
Cash flows from investing activities:      
Payment for short-term investments (327,244) (1,257,697) (468,705)
Proceeds from disposal of short-term investments 853,703 543,790 385,549
Purchase of property, equipment and software (1,499) (710) (6,193)
Proceeds from disposal of property, equipment and software 509 464 28
Provision of bridge loans     (2,930)
Loan repayment     628
Payment for long-term investments (193,014) (1,575) (21,334)
Proceeds from other investing activities   1,503  
Net cash (used in)/generated from investing activities 332,455 (714,225) (112,957)
Cash flows from financing activities:      
Proceeds from issuance of Class A ordinary shares upon Initial Public Offering and related over-allotment option, net of cost of issuance     904,732
Payment for repurchase and cancellation of ordinary shares (3,339) (48,678) (64,000)
Proceeds from issuance of ordinary shares prior to Initial Public Offering     200,000
Proceeds from exercise of share options 1,187 1,039 1,070
Proceeds from issuance of Class A ordinary shares upon the Dual Primary Listing, net of cost of issuance   9,057  
Payments of deferred offering costs (71)    
Net cash generated from/ (used in) financing activities (2,223) (38,582) 1,041,802
Effect of exchange rate changes on cash and cash equivalents, restricted cash (1,148) (7,954) 2,879
Net increase/ (decrease) in cash and cash equivalents, restricted cash 365,527 (831,415) 805,621
Cash and cash equivalents, restricted cash at the beginning of year 133,161 964,576 158,955
Cash and cash equivalents, restricted cash at the end of year 498,688 133,161 964,576
Supplemental cash flow disclosures      
Cash paid for income tax (2,819) (843) (616)
Supplemental schedule of non-cash investing activities      
Conversion from bridge loan into investment     2,302
Cash and cash equivalents 498,688 133,161 963,938
Restricted cash     638
Total cash, cash equivalents and restricted cash shown in the statement of cash flows $ 498,688 $ 133,161 $ 964,576