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
Deferred Tax Assets, Valuation Allowance $ 26,939 $ 24,864
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent 21.00% 21.00%
Research Tax Credit Carryforward [Member]    
Tax Credit Carryforward, Amount $ 2,600  
Domestic Tax Authority [Member]    
Operating Loss Carryforwards $ 67,000  
Operating Loss Carry forward, Expire Period 2035  
State and Local Jurisdiction [Member]    
Operating Loss Carryforwards $ 125,500  
Operating Loss Carry forward, Expire Period 2028  
Indefinite Carryforward | Domestic Tax Authority [Member]    
Operating Loss Carryforwards $ 52,500  
Indefinite Carryforward | State and Local Jurisdiction [Member]    
Operating Loss Carryforwards $ 14,500