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Statutory Reserves and Restricted Net Assets - Statement of Cash Flows (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Statement of Cash Flows      
Net cash generated from/(used in) operating activities $ 36,443 $ (70,654) $ (126,103)
Net cash (used in)/generated from investing activities 332,455 (714,225) (112,957)
Proceeds from issuance of Class A ordinary shares upon U.S. IPO 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
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
Reportable Legal Entities | Parent Company      
Statement of Cash Flows      
Net cash generated from/(used in) operating activities (3,478) (1,408) 11,255
Advance to, and investment in subsidiaries (7,940)   (1,037,244)
Proceeds from subsidiaries 30,349 28,842  
Net cash (used in)/generated from investing activities 22,409 28,842 (1,037,244)
Proceeds from issuance of Class A ordinary shares upon U.S. IPO 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 Class A ordinary shares upon the Dual Primary Listing, net of cost of issuance   9,057  
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
Payments of deferred offering costs (71)    
Net cash generated from/ (used in) financing activities (2,223) (38,582) 1,041,802
Net increase/ (decrease) in cash and cash equivalents, restricted cash 16,708 (11,148) 15,813
Cash and cash equivalents, restricted cash at the beginning of year 4,685 15,833 20
Cash and cash equivalents, restricted cash at the end of year $ 21,393 $ 4,685 $ 15,833