Condensed 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	$ 61,000	19,302,000		19,363,000
Sale of common stock, net of issuance costs (in shares)	6,153,847
Exercise of warrants	$ 1,000	290,000		291,000
Exercise 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)	(924)
Exercise of stock options		154,000		154,000
Exercise of stock options (in shares)	46,134
Issuance of inducement stock awards (in shares)	23,732
Stock-based compensation		1,749,000		1,749,000
Net loss			(11,689,000)	(11,689,000)
Balances at Jun. 30, 2021	$ 249,000	219,761,000	(191,391,000)	28,619,000
Balances (in shares) at Jun. 30, 2021	24,937,826
Balances at Mar. 31, 2021	$ 249,000	218,960,000	(185,197,000)	34,012,000
Balances (in shares) at Mar. 31, 2021	24,940,442
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)	(924)
Issuance of inducement stock awards (in shares)	23,732
Stock-based compensation		907,000		907,000
Net loss			(6,194,000)	(6,194,000)
Balances at Jun. 30, 2021	$ 249,000	219,761,000	(191,391,000)	28,619,000
Balances (in shares) at Jun. 30, 2021	24,937,826
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		71,000		$ 71,000
Exercise of stock options (in shares)	21,775			21,775
Stock-based compensation		1,442,000		$ 1,442,000
Net loss			(17,989,000)	(17,989,000)
Balances at Jun. 30, 2022	$ 361,000	273,776,000	(220,846,000)	53,291,000
Balances (in shares) at Jun. 30, 2022	36,128,194
Balances at Mar. 31, 2022	$ 361,000	272,809,000	(211,631,000)	61,539,000
Balances (in shares) at Mar. 31, 2022	36,112,053
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)	(123)
Exercise of stock options		71,000		71,000
Exercise of stock options (in shares)	21,775
Issuance cost in connection with sale of common stock		(32,000)		(32,000)
Stock-based compensation		949,000		949,000
Net loss			(9,215,000)	(9,215,000)
Balances at Jun. 30, 2022	$ 361,000	$ 273,776,000	$ (220,846,000)	$ 53,291,000
Balances (in shares) at Jun. 30, 2022	36,128,194