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Fair Value of Measurements - Changes in the fair value (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended | 24 Months Ended
--- | --- | --- | ---
Mar. 31, 2024 | Mar. 31, 2023 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2023
Fair Value of Measurements |  |  |  |  |
Change in fair value of convertible promissory notes, Extensible list | Other income (expense), net | Other income (expense), net |  |  | Interest to pay dissolution expenses
Convertible Debt [Member] |  |  |  |  |
Fair Value of Measurements |  |  |  |  |
Fair value as of beginning of period | $ 34,033 | $ 31,166 | $ 31,166 | $ 56,996 | $ 56,996
Change in fair value of convertible promissory notes | 1,203 | (549) | 1,428 | 450 |
Conversion of convertible promissory notes |  |  | (61) | (33,140) |
Repayment of convertible promissory notes |  |  | (500) | (1,140) |
Transfer of convertible promissory notes to bank borrowings |  |  |  | (1,000) |
Borrowing of convertible promissory notes | 16,290 |  | 2,000 | 9,000 |
Fair value as of end of period | $ 10,317 | $ 30,617 | $ 34,033 | $ 31,166 | $ 34,033

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- Definition Amount of gain (loss) recognized in income from liability measured at fair value on recurring basis using unobservable input (level 3). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 + Details
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- Definition Amount of transfers of financial instrument classified as a liability into (out of) level 3 of the fair value hierarchy. + References No definition available. + Details
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