Income Taxes (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Operating Loss Carryforwards [Line Items]
Income tax expense	$ 26,000	$ 0	$ 49,000	$ 0
Unrecognized tax benefits	100,000		100,000		$ 100,000
Significant change to unrecognized tax benefits over the next 12 months	$ 0		$ 0
Federal
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards					234,900,000
State
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards					145,600,000
R&D credit
Operating Loss Carryforwards [Line Items]
Credit carryforwards					$ 4,000,000.0