Consolidated Statements of Stockholders' Equity - USD ($)	Common Stock [Member]	Additional Paid-in Capital [Member]	Accumulated Deficit [Member]	Total
Balances at Dec. 31, 2020	$ 187,000	$ 198,372,000	$ (179,702,000)	$ 18,857,000
Balances (in shares) at Dec. 31, 2020	18,688,461
Sale of common stock, net of issuance costs	$ 83,000	26,223,000		26,306,000
Sale of common stock, net of issuance costs (in shares)	8,275,060
Exercises of warrants	$ 1,000	290,000		291,000
Exercises of warrants (in shares)	52,000
Return of restricted stock awards for tax withholdings		(106,000)		(106,000)
Return of restricted stock awards for tax withholdings, shares	(25,424)
Forfeiture of restricted stock awards (in shares)	(1,047)
Exercise of stock options		322,000		322,000
Exercise of stock options (in shares)	99,517
Issuance of inducement stock awards (in shares)	23,732
Stock-based compensation		2,882,000		2,882,000
Net loss			(23,155,000)	(23,155,000)
Balances at Dec. 31, 2021	$ 271,000	227,983,000	(202,857,000)	25,397,000
Balances (in shares) at Dec. 31, 2021	27,112,299
Sale of common stock, net of issuance costs	$ 90,000	44,301,000		44,391,000
Sale of common stock, net of issuance costs (in shares)	9,000,000
Return of restricted stock awards for tax withholdings		(21,000)		(21,000)
Return of restricted stock awards for tax withholdings, shares	(5,511)
Forfeiture of restricted stock awards (in shares)	(369)
Exercise of stock options		125,000		$ 125,000
Exercise of stock options (in shares)	38,287			38,287
Stock-based compensation		3,105,000		$ 3,105,000
Net loss			(36,917,000)	(36,917,000)
Balances at Dec. 31, 2022	$ 361,000	$ 275,493,000	$ (239,774,000)	$ 36,080,000
Balances (in shares) at Dec. 31, 2022	36,144,706