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Ordinary Shares - Activities of the Group's Class A ordinary shares and Class B ordinary shares (Details) - USD ($) $ / shares in Units, $ in Thousands |  |  |  |  | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 15, 2023 | Mar. 28, 2023 | Oct. 18, 2021 | Sep. 13, 2021 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Nov. 01, 2022 | Dec. 31, 2020 | Dec. 31, 2019 | Aug. 28, 2014
Ordinary Shares |  |  |  |  |  |  |  |  |  |  |
Beginning Balance |  |  |  |  | $ 962,167 | $ 1,113,661 | $ (164,667) |  |  |  |
Issuance of ordinary shares upon Initial Public Offering and related over-allotment option, net of cost of issuance |  |  |  |  |  |  | 904,732 |  |  |  |
Cancellation of Treasury stock (in shares) | 1,200,794 | 2,753,167 |  |  |  |  |  |  |  |  |
Ending Balance |  |  |  |  | $ 970,565 | $ 962,167 | $ 1,113,661 |  |  |  |
Ordinary shares, par value |  |  |  |  | $ 0.00005 | $ 0.00005 | $ 0.00005 |  | $ 0.00005 | $ 0.00005 | $ 0.00005
Common Stock |  |  |  |  |  |  |  |  |  |  |
Ordinary Shares |  |  |  |  |  |  |  |  |  |  |
Beginning Balance (in shares) |  |  |  |  | 578,546,560 | 571,246,560 | 221,980,000 |  |  |  |
Beginning Balance |  |  |  |  | $ 29 | $ 29 | $ 11 |  |  |  |
Issuance of ordinary shares upon Initial Public Offering and related over-allotment option, net of cost of issuance (in shares) |  |  |  |  |  |  | 45,076,479 |  |  |  |
Issuance of ordinary shares upon Initial Public Offering and related over-allotment option, net of cost of issuance |  |  |  |  |  |  | $ 2 |  |  |  |
Cancellation of Treasury stock (in shares) |  |  |  |  | (3,953,961) |  |  |  |  |  |
Issuance of ordinary shares reserved for equity incentive plan (in shares) |  |  |  |  |  |  | 10,000,000 |  |  |  |
Issuance of ordinary shares reserved for equity incentive plan |  |  |  |  |  |  | $ 1 |  |  |  |
Ending Balance (in shares) |  |  |  |  | 574,592,599 | 578,546,560 | 571,246,560 |  |  |  |
Ending Balance |  |  |  |  | $ 29 | $ 29 | $ 29 |  |  |  |
Common Class A |  |  |  |  |  |  |  |  |  |  |
Ordinary Shares |  |  |  |  |  |  |  |  |  |  |
Issuance of ordinary shares upon Initial Public Offering and related over-allotment option, net of cost of issuance (in shares) |  |  | 5,000,000 | 5,000,000 |  |  |  |  |  |  |
Ordinary shares, par value |  |  |  |  | $ 0.00005 | $ 0.00005 |  | $ 0.00005 |  |  |
Common Class A | Common Stock |  |  |  |  |  |  |  |  |  |  |
Ordinary Shares |  |  |  |  |  |  |  |  |  |  |
Beginning Balance (in shares) |  |  |  |  | 499,146,560 | 491,846,560 |  |  |  |  |
Beginning Balance |  |  |  |  | $ 25 | $ 25 |  |  |  |  |
Issuance of ordinary shares upon Initial Public Offering and related over-allotment option, net of cost of issuance (in shares) |  |  |  |  |  | 7,300,000 |  |  |  |  |
Issuance of ordinary shares upon Initial Public Offering and related over-allotment option, net of cost of issuance |  |  |  |  |  | $ 0 |  |  |  |  |
Cancellation of Treasury stock (in shares) |  |  |  |  | (3,953,961) |  |  |  |  |  |
Conversion of Class B ordinary shares to Class A ordinary shares |  |  |  |  | 9,194,700 |  |  |  |  |  |
Ending Balance (in shares) |  |  |  |  | 504,387,299 | 499,146,560 | 491,846,560 |  |  |  |
Ending Balance |  |  |  |  | $ 25 | $ 25 | $ 25 |  |  |  |
Common Class B |  |  |  |  |  |  |  |  |  |  |
Ordinary Shares |  |  |  |  |  |  |  |  |  |  |
Ordinary shares, par value |  |  |  |  | $ 0.00005 | $ 0.00005 |  |  |  |  |
Common Class B | Common Stock |  |  |  |  |  |  |  |  |  |  |
Ordinary Shares |  |  |  |  |  |  |  |  |  |  |
Beginning Balance (in shares) |  |  |  |  | 79,400,000 | 79,400,000 |  |  |  |  |
Beginning Balance |  |  |  |  | $ 4 | $ 4 |  |  |  |  |
Issuance of ordinary shares upon Initial Public Offering and related over-allotment option, net of cost of issuance (in shares) |  |  |  |  |  | 0 |  |  |  |  |
Issuance of ordinary shares upon Initial Public Offering and related over-allotment option, net of cost of issuance |  |  |  |  |  | $ 0 |  |  |  |  |
Cancellation of Treasury stock (in shares) |  |  |  |  | 0 |  |  |  |  |  |
Conversion of Class B ordinary shares to Class A ordinary shares |  |  |  |  | (9,194,700) |  |  |  |  |  |
Ending Balance (in shares) |  |  |  |  | 70,205,300 | 79,400,000 | 79,400,000 |  |  |  |
Ending Balance |  |  |  |  | $ 4 | $ 4 | $ 4 |  |  |  |
Total of Class A ordinary shares and Class B ordinary shares [Member] | Common Stock |  |  |  |  |  |  |  |  |  |  |
Ordinary Shares |  |  |  |  |  |  |  |  |  |  |
Beginning Balance (in shares) |  |  |  |  | 578,546,560 | 571,246,560 |  |  |  |  |
Beginning Balance |  |  |  |  | $ 29 | $ 29 |  |  |  |  |
Issuance of ordinary shares upon Initial Public Offering and related over-allotment option, net of cost of issuance (in shares) |  |  |  |  |  | 7,300,000 |  |  |  |  |
Issuance of ordinary shares upon Initial Public Offering and related over-allotment option, net of cost of issuance |  |  |  |  |  | $ 0 |  |  |  |  |
Cancellation of Treasury stock (in shares) |  |  |  |  | (3,953,961) |  |  |  |  |  |
Ending Balance (in shares) |  |  |  |  | 574,592,599 | 578,546,560 | 571,246,560 |  |  |  |
Ending Balance |  |  |  |  | $ 29 | $ 29 | $ 29 |  |  |  |

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