Consolidated Statements of Stockholders' Equity - USD ($)	Common Stock [Member]	Additional Paid-in Capital [Member]	Accumulated Deficit [Member]	Total
Balances at Dec. 31, 2018	$ 51,000	$ 145,685,000	$ (138,042,000)	$ 7,694,000
Balances (in shares) at Dec. 31, 2018	5,069,633
Net loss			(3,739,000)	(3,739,000)
Balances at Mar. 31, 2019	$ 51,000	145,685,000	(141,781,000)	3,955,000
Balances (in shares) at Mar. 31, 2019	5,069,633
Balances at Dec. 31, 2019	$ 99,000	172,015,000	(157,521,000)	14,593,000
Balances (in shares) at Dec. 31, 2019	9,922,758
Sale of common stock, net of issuance costs	$ 87,000	22,755,000		22,842,000
Sale of common stock, net of issuance costs (in shares)	8,710,800
Exercise of warrants		81,000		81,000
Exercise of warrants (in shares)	14,464
Forfeiture of restricted stock awards (in shares)	(3,329)
Stock-based compensation		1,044,000		1,044,000
Net loss			(5,078,000)	(5,078,000)
Balances at Mar. 31, 2020	$ 186,000	$ 195,895,000	$ (162,599,000)	$ 33,482,000
Balances (in shares) at Mar. 31, 2020	18,644,693