Liquidity (Details) - USD ($)	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Jun. 30, 2020	Jun. 12, 2020
Subsidiary, Sale of Stock [Line Items]
Net loss	$ 1,902,000	$ 7,740,000
Net cash used in operating activities	(2,792,000)	$ 7,198,000
Unrestricted cash and cash equivalents	23,000,000
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
Available amount remaining under ATM facility	47,800,000
Western Alliance Bank
Subsidiary, Sale of Stock [Line Items]
Line of credit maximum capacity	10,000,000
Line of credit current availability	7,200,000
Line of credit outstanding borrowings	$ 0