Consolidated Statements of Changes in Stockholders' Equity (Unaudited) - USD ($) $ in Thousands	Common Stock	Preferred Stock	Additional Paid-in Capital	Treasury Stock	Accumulated Deficit	Total
Balance at Dec. 31, 2018			$ 152,445	$ (264)	$ (140,083)	$ 12,098
Balance, shares at Dec. 31, 2018	2,010,025	5,559		3
Issuance of common stock, common warrants and prefunded warrants, net of offering cost			787			787
Issuance of common stock, common warrants and prefunded warrants, net of offering cost, shares	221,000
Fractional shares adjusted for reverse split
Fractional shares adjusted for reverse split, shares	3,371
Issuance of common stock, net of offering cost / At-the-market offering			523			523
Issuance of common stock, net of offering cost / At-the-market offering, shares	239,359
Exercise of prefunded common stock warrants
Exercise of prefunded common stock warrants, shares	201,961
Warrant exercise
Warrant exercise, shares	33,333
Exchange of common shares for prefunded warrants
Exchange of common shares for prefunded warrants, shares	(115,269)
Stock-based compensation			329			329
Net loss					(5,156)	(5,156)
Balance at Sep. 30, 2019			154,084	$ (264)	(145,239)	8,581
Balance, shares at Sep. 30, 2019	2,593,780	5,559		3
Balance at Jun. 30, 2019			153,347	$ (264)	(141,876)	11,207
Balance, shares at Jun. 30, 2019	2,321,088	5,559		3
Issuance of common stock, net of offering cost / At-the-market offering			523			523
Issuance of common stock, net of offering cost / At-the-market offering, shares	239,359
Warrant exercise
Warrant exercise, shares	33,333
Stock-based compensation			214			214
Net loss					(3,363)	(3,363)
Balance at Sep. 30, 2019			154,084	$ (264)	(145,239)	8,581
Balance, shares at Sep. 30, 2019	2,593,780	5,559		3
Balance at Dec. 31, 2019			155,062	$ (264)	(144,266)	10,532
Balance, shares at Dec. 31, 2019	4,825,549	5,559		3
Issuance of common stock, common warrants and prefunded warrants, net of offering cost			6,559			6,559
Issuance of common stock, common warrants and prefunded warrants, net of offering cost, shares	3,245,745
Issuance of common stock, net of offering cost	$ 2		17,843			17,845
Issuance of common stock, net of offering cost, shares	16,090,909
Common warrant and prefunded warrant exercise	$ 1		7,203			7,204
Common warrant and prefunded warrant exercise, shares	10,758,016
Distribution of Hoth common stock			(269)			(269)
Net loss					(12,663)	(12,663)
Balance at Sep. 30, 2020	$ 3		186,398	$ (264)	(156,929)	29,208
Balance, shares at Sep. 30, 2020	34,920,219	5,559		3
Balance at Jun. 30, 2020	$ 3		186,667	$ (264)	(154,912)	31,494
Balance, shares at Jun. 30, 2020	34,920,219	5,559		3
Distribution of Hoth common stock			(269)			(269)
Net loss					(2,017)	(2,017)
Balance at Sep. 30, 2020	$ 3		$ 186,398	$ (264)	$ (156,929)	$ 29,208
Balance, shares at Sep. 30, 2020	34,920,219	5,559		3