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Income Taxes - Foreign Currency Exchange Rate Fluctuations, Changes in Net Operating Losses and Credit Carryforwards (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Operating Loss Carryforwards    
CARES act tax rate benefit (as a percent) 20.90%  
Valuation allowance (as a percent) 41.10%  
Deferred Tax Liability Not Recognized, Undistributed Earnings of Foreign Subsidiaries [Abstract]    
Provision for U.S. federal and state taxes on cumulative foreign earnings $ 0  
State    
Operating Loss Carryforwards    
Research and development tax credit carryforwards 0  
Foreign    
Deferred Tax Liability Not Recognized, Undistributed Earnings of Foreign Subsidiaries [Abstract]    
Provision for U.S. federal and state taxes on cumulative foreign earnings   $ 0
Federal    
Operating Loss Carryforwards    
Research and development tax credit carryforwards $ 645