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Income Taxes - Reconciliation Effective Tax Rate (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Income Taxes    
Provision for income taxes $ 260  
Reconciliation of statutory federal income tax    
Tax at statutory federal rate (21.00%) (21.00%)
State taxes, net of federal benefit (1.50%) (0.80%)
Stock-based compensation 5.40% 2.00%
Change in uncertain tax benefits 3.10%  
Change in valuation allowance 17.00% 18.90%
Other   0.90%
Provision for income taxes 3.00% 0.00%