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Income Taxes - Reconciliation Effective Tax Rate (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Income Taxes    
Provision for income taxes $ 0 $ 0
Reconciliation of statutory federal income tax    
Tax at statutory federal rate (21.00%) (21.00%)
State taxes, net of federal benefit (0.80%) (1.70%)
Stock-based compensation 2.00% 1.50%
Nondeductible executive compensation   0.90%
Change in valuation allowance 18.90% 20.60%
Other 0.90% (0.30%)
Provision for income taxes 0.00% 0.00%