Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Operating Loss Carryforwards [Line Items]
Income tax expense	$ 23	$ 0
Unrecognized tax benefits (less than)	$ 100		$ 100
Federal
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards			234,900
State
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards			145,600
R&D credit
Operating Loss Carryforwards [Line Items]
Credit carryforwards			$ 4,000