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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Cash flows from operating activities:      
Net loss $ (42,727) $ (87,219) $ (120,380)
Share-based compensation expense 22,737 24,612 32,363
Allowance for current expected credit losses 8,728 7,046 5,391
Depreciation of property and equipment 3,459 7,096 9,497
Amortization of intangible assets 663 1,384 2,322
Amortization of land use right 3,423 3,165  
Deferred tax benefit (102) (212) (336)
Amortization of right-of-use asset 2,576 2,935 4,064
Interest income on debt securities 0 (105) (401)
Equity in income of affiliates 3,479 31 (244)
Losses from extinguishment of convertible note   1,230  
Investment loss 3,328 18,526 8,607
Impairment of goodwill   31,928 11,941
Return on investment from equity affiliates   21  
Gain on disposal of property and equipment (9) (11)  
Changes in assets and liabilities, net of effect of acquisition:      
Accounts receivable (5,047) (9,100) (8,033)
Contract assets (67) (522) (564)
Prepayments and other current assets (13,893) (1,801) (515)
Other non-current assets 5,855 (7,278) 3,146
Accounts payable (248) 3,246 5,526
Advances from customers 1,071 (483) 1,371
Taxes payable 1,326 (1,157) (391)
Operating lease liabilities (2,878) (2,649) (4,212)
Deferred income 62 (160) 402
Accrued expenses and other liabilities (5,865) (4,134) (1,934)
Net cash used in operating activities (14,129) (13,611) (52,380)
Cash flows from investing activities:      
Purchase of short-term bank deposits (68,300) (219,445) (424,627)
Purchase of short-term financial products issued by banks (70,391) (29,899) (19,787)
Purchase of short-term investments 0 (791) (14,650)
Proceeds from maturity of short-term bank deposits 130,020 467,058 538,765
Proceeds from maturity of short-term financial products issued by banks 105,395 17,522 3,549
Proceeds from sale of short-term investments 235    
Purchase of long-term bank deposits (35,500) (143,127) (40,657)
Purchase of long-term financial products issued by banks (61,400) (20,000)  
Purchase of long-term investments (562) (15) (18,160)
Purchase of property and equipment (2,546) (924) (4,123)
Prepayment for a long-term investment     (1,949)
Withdrawal of long-term investments     2,113
Deposit for land use right purchase     (34,159)
Withdrawal of deposit for land use right purchase     34,159
Prepayment for land use rights purchase     (171,592)
Purchase of land use right   (5,133)  
Purchase of construction in progress for the headquarters project (35,248) (10,792)  
Cash received for business disposal   5,769  
Cash paid for an acquisition   (3,680)  
Disposal of property and equipment 93 92  
Cash received from disposal of long-term investments 155    
Return of investment from equity affiliates   8 56
Advance payment received for business disposal     7,000
Net cash (used in) provided by investing activities (38,049) 56,643 (144,062)
Cash flows from financing activities:      
Proceeds from long-term borrowings for headquarters project 35,790 10,909  
Proceeds from exercise of employees' share options 853 634 1,096
Deposit received in relation to headquarters project 20,408    
Payment of financing cost 0   (2,111)
Deposits received for business disposal     1,000
Deposits returned for business disposal   (1,000)  
Net cash (used in) provided by financing activities 45,994 (52,368) (41,150)
Effect of foreign exchange rate changes on cash, cash equivalents and restricted cash (162) (805) (918)
Net decrease in cash, cash equivalents and restricted cash (6,346) (10,141) (238,510)
Cash balance recorded in held-for-sale assets     1,488
Cash, cash equivalents and restricted cash     47,314
Cash, cash equivalents and restricted cash at beginning of year 37,173 45,826 285,824
Cash, cash equivalents and restricted cash at end of year 30,827 37,173 45,826
Supplemental disclosure of cash flow information:      
Income taxes paid 185 152 55
Cash paid for fixed operating lease costs included in the measurement of lease obligations in operating activities 2,878 2,649 4,212
Right-of-use assets obtained in exchange for operating lease obligations 2,325 4,588 198
Non-cash financing and investing activities:      
Payables for property and equipment 398 12 227
Proceeds receivable from exercise of employees' share options 417 116 90
Deposits utilized for employees' share option exercises     13
Payables for treasury shares, at cost 83 210 680
Payables for construction in progress for the headquarters project 12,834 7,098 1,184
Settlement of compensation costs in relation to an acquisition with shares   1,830  
Class A Ordinary Shares      
Cash flows from financing activities:      
Repurchase of Class A ordinary shares $ (11,057) $ (62,911) $ (41,135)