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Income Taxes - Summary of Valuation Allowance (Details) - SEC Schedule, 12-09, Valuation Allowance, Deferred Tax Asset - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Valuation Allowance [Roll Forward]    
Balance at beginning of year $ (36,948) $ (7,931)
Change due to foreign exchange (693) (998)
Increase (48,294) (28,019)
Balance at end of year $ (85,935) $ (36,948)