Income Taxes - Narrative (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2020
Tax Credit Carryforward [Line Items]
Release in valuation allowance	$ 15,055,000
Accrued interest and penalties related to income tax matters	$ 0	$ 0
Federal
Tax Credit Carryforward [Line Items]
NOL carryforwards		246,003,000
Operating loss carryforwards, subject to expiration		72,579,000
Operating loss carryforwards, not subject to expiration		173,424,000
Federal | R&D
Tax Credit Carryforward [Line Items]
Tax credit carryforwards		1,464,000
State
Tax Credit Carryforward [Line Items]
NOL carryforwards		149,110,000
State | R&D
Tax Credit Carryforward [Line Items]
Tax credit carryforwards		$ 1,459,000