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Income Taxes, Reconciliation of Federal Statutory Income Tax Rate to Effective Income Tax Rate (Details)	12 Months Ended
	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%)

X

- Definition

Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to changes in the valuation allowance for deferred tax assets.

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to other adjustments.

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to research tax credit.

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