Income Taxes (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Operating Loss Carryforwards [Line Items]
Income tax expense	$ 87,000	$ 0	$ 87,000	$ 0
Unrecognized tax benefits (less than)	$ 100,000		$ 100,000		$ 100,000
Federal
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards					165,000,000.0
State
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards					347,100,000
R&D credit
Operating Loss Carryforwards [Line Items]
Credit carryforwards					$ 2,800,000