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, 2018	$ 1	$ 92,151	$ (85,838)	$ 6,314
Balance (in Shares) at Dec. 31, 2018	1,173,854
Issuance of common stock, sold for cash, net		3,630		3,630
Issuance of common stock, sold for cash, net (in Shares)	151,852
Issuance of common stock for services		34		34
Issuance of common stock for services (in Shares)	7,203
Stock-based compensation		675		675
Issuance of common stock upon exercise of warrants		1,788		1,788
Issuance of common stock upon exercise of warrants (in Shares)	80,501
Issuance of common stock upon exercise of stock options
Issuance of common stock upon exercise of stock options (in Shares)	1,259
Payments for employee withholding taxes related to share-based awards		(55)		(55)
Net loss			(7,238)	(7,238)
Balance at Sep. 30, 2019	$ 1	98,223	(93,076)	5,148
Balance (in Shares) at Sep. 30, 2019	1,414,669
Balance at Jun. 30, 2019	$ 1	94,415	(90,491)	3,925
Balance (in Shares) at Jun. 30, 2019	1,261,628
Issuance of common stock, sold for cash, net		3,630		3,630
Issuance of common stock, sold for cash, net (in Shares)	151,852
Issuance of common stock for services
Issuance of common stock for services (in Shares)	963
Stock-based compensation		204		204
Issuance of common stock upon exercise of warrants		5		5
Issuance of common stock upon exercise of warrants (in Shares)	226
Payments for employee withholding taxes related to share-based awards		(31)		(31)
Net loss			(2,585)	(2,585)
Balance at Sep. 30, 2019	$ 1	98,223	(93,076)	5,148
Balance (in Shares) at Sep. 30, 2019	1,414,669
Balance at Dec. 31, 2019	$ 1	98,433	(95,867)	2,567
Balance (in Shares) at Dec. 31, 2019	1,414,671
Issuance of common stock, sold for cash, net	$ 2	5,739		5,741
Issuance of common stock, sold for cash, net (in Shares)	1,928,180
Warrant antidilution price protection adjustment		414		414
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
Issuance of common stock for services
Issuance of common stock for services (in Shares)	4,543
Stock-based compensation		453		453
Issuance of common stock upon exercise of warrants		238		238
Issuance of common stock upon exercise of warrants (in Shares)	51,414
Net loss			(6,279)	(6,279)
Balance at Sep. 30, 2020	$ 3	105,277	(102,146)	3,134
Balance (in Shares) at Sep. 30, 2020	3,398,832
Balance at Jun. 30, 2020	$ 3	105,117	(100,227)	4,893
Balance (in Shares) at Jun. 30, 2020	3,398,832
Offering expenses for June share offering		(2)		(2)
Stock-based compensation		162		162
Net loss			(1,919)	(1,919)
Balance at Sep. 30, 2020	$ 3	$ 105,277	$ (102,146)	$ 3,134
Balance (in Shares) at Sep. 30, 2020	3,398,832