Liquidity (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021	Dec. 31, 2020	Jun. 30, 2020	Jun. 12, 2020
Subsidiary, Sale of Stock [Line Items]
Net loss	$ 7,740	$ 7,381
Net cash used in operating activities	7,198	5,405
Cash and cash equivalents	20,993		$ 28,219
Restricted cash	200	$ 200	$ 200	$ 200
Shelf registration
Subsidiary, Sale of Stock [Line Items]
Sale of securities, authorized amount					$ 125,000
ATM Facility
Subsidiary, Sale of Stock [Line Items]
Sale of securities, authorized amount						$ 50,000
Amount remaining	47,800
Western Alliance Bank
Subsidiary, Sale of Stock [Line Items]
Line of credit maximum amount	$ 10,000