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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, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Cash flows from Operating activities: |  |  |
Net loss | $ (334,620) | $ (443,286) | $ (704,471)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities: |  |  |
Amortization of deferred income | (3,383) | (2,602) | (521)
Share-based compensation | 79,634 | 61,302 | 40,714
Loss from fair value changes of equity investment of readily determinable fair value | (2,789) | 8,952 | 14,617
Changes in operating assets and liabilities: |  |  |
Prepayments and other current assets | 12,246 | (19,258) | (7,086)
Other current liabilities | 19,810 | 7,392 | 30,142
Net cash provided by (used in) operating activities | (198,178) | (367,642) | (549,231)
Cash flows from investing activities |  |  |
Purchase of short-term investments | (134,000) | (260,274) | (445,000)
Proceeds from maturity of short-term investments | 117,700 | 705,274 | 743,902
Purchase of investment in equity investee | 0 | 0 | (30,000)
Net cash (used in) provided by investing activities | (10,776) | 420,016 | 249,957
Cash flows from financing activities |  |  |
Proceeds from exercises of stock options | 2,369 | 5,870 | 7,417
Proceeds from issuance of ordinary shares upon public offerings | 0 | 0 | 818,875
Payment of public offering costs | 0 | 0 | (1,837)
Taxes paid related to settlement of equity awards | (8,802) | (7,600) | (4,253)
Net cash (used in) provided by financing activities | (6,433) | (1,730) | 820,202
Effect of foreign exchange rate changes on cash, cash equivalents and restricted cash | (2,622) | (6,274) | 1,116
Net (decrease) increase in cash, cash equivalents and restricted cash | (218,009) | 44,370 | 522,044
Cash, cash equivalents and restricted cash — beginning of the year | 1,009,273 | 964,903 | 442,859
Cash, cash equivalents and restricted cash — end of the year | 791,264 | 1,009,273 | 964,903
Parent Company |  |  |
Cash flows from Operating activities: |  |  |
Net loss | (334,620) | (443,286) | (704,471)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities: |  |  |
Amortization of deferred income | 0 | (234) | (312)
Share-based compensation | 3,217 | 3,724 | 3,435
Equity in loss of subsidiaries | 352,449 | 427,514 | 676,099
Loss from fair value changes of equity investment of readily determinable fair value | (2,789) | 8,952 | 14,617
Changes in operating assets and liabilities: |  |  |
Prepayments and other current assets | 2,780 | (7,839) | (439)
Other current liabilities | (379) | 1,648 | (376)
Net cash provided by (used in) operating activities | 20,658 | (9,521) | (11,447)
Cash flows from investing activities |  |  |
Purchase of short-term investments | 0 | (260,274) | (445,000)
Proceeds from maturity of short-term investments | 0 | 705,274 | 743,902
Purchase of investment in equity investee | 0 | 0 | (30,000)
Investment in subsidiaries | (392,893) | (80,942) | (884,342)
Net cash (used in) provided by investing activities | (392,893) | 364,058 | (615,440)
Cash flows from financing activities |  |  |
Proceeds from exercises of stock options | 2,369 | 5,870 | 7,418
Proceeds from issuance of ordinary shares upon public offerings | 0 | 0 | 818,875
Payment of public offering costs | 0 | 0 | (1,692)
Taxes paid related to settlement of equity awards | (8,802) | (7,600) | (4,253)
Net cash (used in) provided by financing activities | (6,433) | (1,730) | 820,348
Effect of foreign exchange rate changes on cash, cash equivalents and restricted cash | 0 | 0 | 773
Net (decrease) increase in cash, cash equivalents and restricted cash | (378,668) | 352,807 | 194,234
Cash, cash equivalents and restricted cash — beginning of the year | 944,649 | 591,842 | 397,608
Cash, cash equivalents and restricted cash — end of the year | $ 565,981 | $ 944,649 | $ 591,842

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- Definition The cash outflow associated with the acquisition of or advances to an entity that is related to it but not strictly controlled (for example, an unconsolidated subsidiary, affiliate, and joint venture or equity method investment) or the acquisition of an additional interest in a subsidiary (controlled entity). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482740/230-10-45-13 + Details
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- Definition The cash outflow for securities or other assets acquired, which qualify for treatment as an investing activity and are to be liquidated, if necessary, within the current operating cycle. Includes cash flows from securities classified as trading securities that were acquired for reasons other than sale in the short-term. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 230 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 13 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482740/230-10-45-13 + Details
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- Definition The cash inflow associated with the amount received from entity's first offering of stock to the public. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 45 -Paragraph 14 -Subparagraph (a) -SubTopic 10 -Topic 230 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482740/230-10-45-14 + Details
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- Definition Amount of cash inflow from exercise of option under share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 45 -Paragraph 14 -Subparagraph (a) -SubTopic 10 -Topic 230 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482740/230-10-45-14 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 2A -Subparagraph (a) -SubTopic 10 -Topic 718 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2A + Details
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- Definition Amount of noncash expense for share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 45 -Paragraph 28 -Subparagraph (a) -SubTopic 10 -Topic 230 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482740/230-10-45-28 + Details
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