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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