Annual report pursuant to Section 13 and 15(d)

Income Taxes - Additional Information (Details)

v3.21.1
Income Taxes - Additional Information (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Income Taxes        
Operating Loss Carryforwards, Expiration Period 2039      
Operating Loss Carryforwards $ 638      
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount $ (958) $ 2,618    
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent 21.00% 21.00%    
Domestic Tax Authority [Member]        
Income Taxes        
Operating Loss Carryforwards $ 62,148     $ 46,055
Tax Credit Carryforward, Amount $ 16,093 $ 16,093 $ 16,093  
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent 80.00%      
Foreign Tax Authority [Member]        
Income Taxes        
Operating Loss Carryforwards $ 6,081      
State and Local Jurisdiction [Member]        
Income Taxes        
Operating Loss Carryforwards 43,212 $ 41,088    
Tax Credit Carryforward, Amount $ 495      
Research Tax Credit Carryforward [Member]        
Income Taxes        
Operating Loss Carryforwards, Expiration Period 2040      
Research Tax Credit Carryforward [Member] | Domestic Tax Authority [Member]        
Income Taxes        
Tax Credit Carryforward, Amount $ 2,304