Condensed Statements of Changes in Stockholders' Equity (Deficit) (Unaudited) - USD ($) $ in Thousands	Common Stock	Additional Paid-In Capital	Accumulated Deficit	Total
Balance at Dec. 31, 2019	$ 1	$ 98,433	$ (95,867)	$ 2,567
Balance (in Shares) at Dec. 31, 2019	1,414,671
Stock based compensation		151		151
Issuance of common stock, sold for cash, net	$ 1	1,707		1,708
Issuance of common stock, sold for cash, net (in Shares)	353,872
Issuance of common stock upon exercise of warrants		238		238
Issuance of common stock upon exercise of warrants (in Shares)	51,414
Issuance costs of common stock issuances		(273)		(273)
Issuance of common stock for fractional shares-20-1 reverse split
Issuance of common stock for fractional shares-20-1 reverse split (in Shares)	24
Warrant antidilution price protection adjustment		414		414
Net loss			(2,731)	(2,731)
Balance at Mar. 31, 2020	$ 2	100,670	(98,598)	2,074
Balance (in Shares) at Mar. 31, 2020	1,819,981
Balance at Dec. 31, 2020	$ 5	108,119	(104,240)	3,884
Balance (in Shares) at Dec. 31, 2020	5,099,512
Stock based compensation		155		155
Issuance of common stock, sold for cash, net	$ 6	12,586		12,592
Issuance of common stock, sold for cash, net (in Shares)	6,163,854
Issuance of common stock upon exercise of warrants	$ 1	1,208		1,209
Issuance of common stock upon exercise of warrants (in Shares)	900,680
Issuance costs of common stock issuances		(171)		(171)
Net loss			(1,821)	(1,821)
Balance at Mar. 31, 2021	$ 12	$ 121,897	$ (106,061)	$ 15,848
Balance (in Shares) at Mar. 31, 2021	12,164,046