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Income Taxes, Reconciliation of Federal Statutory Income Tax Rate to Effective Income Tax Rate (Details) | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
Effective Tax Rate Reconciliation [Abstract] |  |
United States federal statutory rate | 21.00% | 21.00%
State taxes, net of federal benefit | 1.99% | (0.01%)
Valuation allowance | (21.96%) | (24.33%)
Accounting method change - ASC 606 | 0.00% | 2.07%
R&D Credit | 1.34% | 1.53%
Other | (0.38%) | (0.27%)
Effective income tax rate | 1.99% | (0.01%)

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