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Income Taxes - Unrecognized Deferred Tax Assets (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Unused tax credits |  |
Statement [line items] |  |
Deductible temporary differences for which no deferred tax asset is recognised | $ 1,560 | $ 1,560
Unused operating loss carryforwards-statutory tax |  |
Statement [line items] |  |
Deductible temporary differences for which no deferred tax asset is recognised | 215,956 | 206,259
Unused operating loss carryforwards-undistributed earnings tax |  |
Statement [line items] |  |
Deductible temporary differences for which no deferred tax asset is recognised | 288,301 | 271,093
Others |  |
Statement [line items] |  |
Deductible temporary differences for which no deferred tax asset is recognised | 19,468 | 29,413
Total |  |
Statement [line items] |  |
Deductible temporary differences for which no deferred tax asset is recognised | $ 525,285 | $ 508,325

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