Condensed Statement of Changes in Stockholders' Equity (Deficit) (Unaudited) - USD ($) $ in Thousands	Common Stock	Additional Paid-In Capital	Accumulated Deficit	Total
Balance at beginning at Dec. 31, 2018	$ 1	$ 92,151	$ (85,838)	$ 6,314
Balance at beginning, shares at Dec. 31, 2018	1,173,854
Issuance of common stock for services		34		34
Issuance of common stock for services, shares	6,240
Stock-based compensation		471		471
Issuance of common stock upon exercise of warrants		1,783		1,783
Issuance of common stock upon exercise of warrants, in shares	80,285
Issuance of common stock upon exercise of stock options
Issuance of common stock upon exercise of stock options, shares	1,259
Payments for employee withholding taxes related to share-based awards		(24)		(24)
Net loss			(4,653)	(4,653)
Balance at ending at Jun. 30, 2019	$ 1	94,415	(90,491)	3,925
Balance at ending, shares at Jun. 30, 2019	1,261,638
Balance at beginning at Mar. 31, 2019	$ 1	92,471	(88,202)	4,270
Balance at beginning, shares at Mar. 31, 2019	1,178,297
Issuance of common stock for services		2		2
Issuance of common stock for services, shares	4,311
Stock-based compensation		219		219
Issuance of common stock upon exercise of warrants		1,747		1,747
Issuance of common stock upon exercise of warrants, in shares	78,694
Issuance of common stock upon exercise of stock options
Issuance of common stock upon exercise of stock options, shares	326
Payments for employee withholding taxes related to share-based awards		(24)		(24)
Net loss			(2,289)	(2,289)
Balance at ending at Jun. 30, 2019	$ 1	94,415	(90,491)	3,925
Balance at ending, shares at Jun. 30, 2019	1,261,638
Balance at beginning at Dec. 31, 2019	$ 1	98,433	(95,867)	2,567
Balance at beginning, shares at Dec. 31, 2019	1,414,671
Issuance of common stock for services
Issuance of common stock for services, shares	4,543
Stock-based compensation		291		291
Issuance of common stock upon exercise of warrants		238		238
Issuance of common stock upon exercise of warrants, in shares	51,414
Issuance of common stock, sold for cash, net	$ 2	5,741		5,743
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, shares	24
Net loss			(4,360)	(3,946)
Balance at ending at Jun. 30, 2020	$ 3	105,117	(100,227)	4,893
Balance at ending, shares at Jun. 30, 2020	3,398,832
Balance at beginning at Mar. 31, 2020	$ 2	100,670	(98,598)	2,074
Balance at beginning, shares at Mar. 31, 2020	1,819,981
Issuance of common stock for services
Issuance of common stock for services, shares	4,543
Stock-based compensation		141		141
Issuance of common stock, sold for cash, net	$ 1	4,306		4,307
Issuance of common stock, sold for cash, net, in shares	1,574,308
Net loss			(1,629)	(1,629)
Balance at ending at Jun. 30, 2020	$ 3	$ 105,117	$ (100,227)	$ 4,893
Balance at ending, shares at Jun. 30, 2020	3,398,832