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Schedule I — Condensed Financial Information of Registrant - Condensed Statements of Cash Flows (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Cash flows from operating activities:      
Net loss $ (175,537) $ (257,103) $ (334,620)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:      
Share-based compensation 65,598 70,651 79,634
Loss from fair value changes of equity investment of readily determinable fair value 1,912 6,105 (2,789)
Changes in operating assets and liabilities:      
Prepayments and other current assets 5,059 (18,729) 12,246
Other current liabilities 4,750 (22,022) 19,810
Net cash used in operating activities (150,789) (214,869) (198,178)
Cash flows from investing activities      
Purchases of short-term investments (10,000) (330,000) (134,000)
Proceeds from maturity of short-term investments 330,000 16,300 117,700
Net cash provided by (used in) investing activities 307,866 (375,193) (10,776)
Cash flows from financing activities      
Proceeds from exercises of stock options 13,675 3,200 2,369
Proceeds from issuance of ordinary shares upon public offerings 0 217,350 0
Payment of public offering costs (854) (1,283) 0
Employee taxes paid related to settlement of equity awards (8,218) 0 (8,802)
Net cash provided by (used in) financing activities 72,353 349,889 (6,433)
Effect of foreign exchange rate changes on cash and cash equivalent 478 (310) (2,622)
Net increase (decrease) in cash, cash equivalents and restricted cash 229,908 (240,483) (218,009)
Cash, cash equivalents and restricted cash — beginning of the year 550,781 791,264 1,009,273
Cash, cash equivalents and restricted cash — end of the year 780,689 550,781 791,264
Parent Company      
Cash flows from operating activities:      
Net loss (175,537) (257,103) (334,620)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:      
Share-based compensation 3,189 4,759 3,217
Equity in loss of subsidiaries 182,377 259,558 352,449
Loss from fair value changes of equity investment of readily determinable fair value 1,912 6,105 (2,789)
Changes in operating assets and liabilities:      
Prepayments and other current assets 1,253 2,266 2,780
Other current liabilities (603) (248) (379)
Net cash used in operating activities 12,591 15,337 20,658
Cash flows from investing activities      
Purchases of short-term investments 0 (330,000) 0
Proceeds from maturity of short-term investments 330,000 0 0
Investment in subsidiaries (32,594) (271,830) (392,893)
Net cash provided by (used in) investing activities 297,406 (601,830) (392,893)
Cash flows from financing activities      
Proceeds from exercises of stock options 13,675 3,200 2,369
Proceeds from issuance of ordinary shares upon public offerings 0 217,350 0
Payment of public offering costs (854) (1,283) 0
Employee taxes paid related to settlement of equity awards (8,218) 0 (8,802)
Net cash provided by (used in) financing activities 4,603 219,267 (6,433)
Effect of foreign exchange rate changes on cash and cash equivalent 0 0 0
Net increase (decrease) in cash, cash equivalents and restricted cash 314,600 (367,226) (378,668)
Cash, cash equivalents and restricted cash — beginning of the year 198,755 565,981 944,649
Cash, cash equivalents and restricted cash — end of the year $ 513,355 $ 198,755 $ 565,981