Liquidity (Details) - USD ($) $ / shares in Units, shares in Millions		1 Months Ended	3 Months Ended	12 Months Ended
	Feb. 23, 2021	Jun. 30, 2021	Jun. 30, 2021	Dec. 31, 2021	Dec. 31, 2020	Dec. 11, 2021	Dec. 10, 2021	Oct. 18, 2021	Jun. 30, 2020	Jun. 12, 2020	Dec. 31, 2019
Subsidiary, Sale of Stock [Line Items]
Net loss				$ 27,128,000	$ 19,925,000
Cash and cash equivalents				28,219,000	16,697,000
Restricted cash				200,000	$ 200,000			$ 200,000			$ 200,000
Offering costs	$ 100,000
Shelf Registration
Subsidiary, Sale of Stock [Line Items]
Sale of securities, authorized amount									$ 125,000,000
ATM Facility
Subsidiary, Sale of Stock [Line Items]
Sale of securities, authorized amount										$ 50,000,000
Shares sold (in shares)		0.2	0.2
Proceeds, net of offering costs		$ 1,900,000	$ 1,900,000
Offering costs		$ 300,000	$ 300,000
Price of shares sold (in dollars per share)		$ 10.56	$ 10.56
Amount remaining		$ 47,800,000	$ 47,800,000
Western Alliance Bank
Subsidiary, Sale of Stock [Line Items]
Line of credit maximum amount				$ 10,000,000		$ 10,000,000	$ 7,000,000