Consolidated Statements of Changes in Equity - USD ($) $ in Thousands	Common Stock [Member]		Series B Convertible Preferred Stock [Member]		Series C Convertible Preferred Stock [Member]		Additional Paid-in Capital [Member]	Accumulated Deficit [Member]	Total
Balance at Dec. 31, 2018		[1]		[1]		[1]	$ 156,355	$ (147,592)	$ 8,763
Balance, shares at Dec. 31, 2018	768,615		17,303		61,423
Net loss								(3,207)	(3,207)
Exercise of pre-funded warrants							16		16
Exercise of pre-funded warrants, shares	32,034
Conversion of Series C Convertible Preferred Stock to common shares
Conversion of Series C Convertible Preferred Stock to common shares, shares	854				(2,000)
Share-based compensation related to restricted stock and stock options award, net of forfeitures of shares							68		68
Share-based compensation related to restricted stock and stock options award, net of forfeitures of shares, shares	70,369
Balance at Mar. 31, 2019							156,439	(150,799)	5,640
Balance, shares at Mar. 31, 2019	871,872		17,303		59,423
Balance at Dec. 31, 2019		[1]		[1]		[1]	163,015	(157,632)	5,383
Balance, shares at Dec. 31, 2019	3,916,134		17,303		34,370
Net loss								(1,978)	(1,978)
Exercise of pre-funded warrants							$ 3		$ 3
Exercise of pre-funded warrants, shares	270,000
Conversion of Series C Convertible Preferred Stock to common shares
Conversion of Series C Convertible Preferred Stock to common shares, shares	27,776				(7,812)
Share-based compensation related to restricted stock and stock options award, net of forfeitures of shares							$ 69		$ 69
Share-based compensation related to restricted stock and stock options award, net of forfeitures of shares, shares	(40,000)
Settlement of restricted stock units in shares of common stock
Settlement of restricted stock units in shares of common stock, shares	165,000
Balance at Mar. 31, 2020							$ 163,087	$ (159,610)	$ 3,477
Balance, shares at Mar. 31, 2020	4,338,910		17,303		26,558

[1] Represents an amount less than $1 thousand