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
Exercise of stock options		154,000		154,000
Exercise of stock options (in shares)	46,134
Stock-based compensation		842,000		842,000
Net loss			(5,495,000)	(5,495,000)
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
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	44,333,000		44,423,000
Sale of common stock, net of issuance costs (in shares)	9,000,000
Forfeiture of restricted stock awards (in shares)	(246)
Stock-based compensation		493,000		493,000
Net loss			(8,774,000)	(8,774,000)
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