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Income Taxes - Narrative (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Tax Credit Carryforward [Line Items]
Released valuation allowance for deferred tax assets	$ 15,055,000
Accrued interest and penalties related to income tax matters	0	$ 0
Federal
Tax Credit Carryforward [Line Items]
NOL carryforwards	179,589,000
Federal | R&D
Tax Credit Carryforward [Line Items]
Tax credit carryforwards	1,377,000
State
Tax Credit Carryforward [Line Items]
NOL carryforwards	94,118,000
State | R&D
Tax Credit Carryforward [Line Items]
Tax credit carryforwards	$ 1,383,000

X

- Definition

The amount of estimated penalties and interest accrued as of the balance sheet date arising from income tax examinations.

+ References

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- Definition

Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.

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