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Income Taxes - Reconciliation Between the Statutory Federal Income Tax Rate and the Effective Income Tax Rate (Details)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Income Tax Disclosure [Abstract]    
Tax at federal statutory rate 21.00% 21.00%
Stock-based compensation (1.20%) (29.30%)
Deferred revenue 0.00% (2.80%)
Change in Foreign NOLS due to liquidation 0.00% (8.30%)
Other (0.20%) 3.30%
Change in federal valuation allowance (19.60%) 16.10%
Change in federal NOLs due to 382 study results 0.00% 0.00%
Tax provision 0.00% 0.00%