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Income Taxes - Unrecognized Deferred Tax Assets (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Unused tax credits [member] |  |
IFRS Statement [Line Items] |  |
Deductible temporary differences for which no deferred tax asset is recognised | $ 1,560 | $ 1,560
Unused operating loss carryforwards-statutory tax [Member] |  |
IFRS Statement [Line Items] |  |
Deductible temporary differences for which no deferred tax asset is recognised | 241,371 | 224,566
Unused operating loss carryforwards-undistributed [Member] |  |
IFRS Statement [Line Items] |  |
Deductible temporary differences for which no deferred tax asset is recognised | 261,659 | 229,177
Others [member] |  |
IFRS Statement [Line Items] |  |
Deductible temporary differences for which no deferred tax asset is recognised | 29,897 | 27,333
Total [Member] |  |
IFRS Statement [Line Items] |  |
Deductible temporary differences for which no deferred tax asset is recognised | $ 534,487 | $ 482,636

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