Consolidated Statements of Changes in Stockholders' Equity (Unaudited) (USD $) - USD ($) $ in Thousands	Common Stock [Member]	Preferred Stock [Member]	Additional Paid-in Capital [Member]	Treasury Stock [Member]	Accumulated Deficit [Member]	Total
Beginning Balance at Dec. 31, 2017			$ 149,425	$ (264)	$ (145,055)	$ 4,106
Beginning Balance (in shares) at Dec. 31, 2017	1,467,052	5,559		3
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance common stock in equity raise, net of offering cost			2,700			2,700
Issuance common stock in equity raise, net of offering cost (in shares)	522,876
Stock-based compensation			286			286
Stock-based compensation (in shares)	20,097
Cumulative effect of the changes related to adoption of ASC 606					3,245	3,245
Net loss					(1,884)	(1,884)
Ending Balance at Jun. 30, 2018			152,411	$ (264)	(143,694)	8,453
Ending Balance (in shares) at Jun. 30, 2018	2,010,025	5,559		3
Beginning Balance at Mar. 31, 2018			152,313	$ (264)	(143,296)	8,753
Beginning Balance (in shares) at Mar. 31, 2018	2,004,046	5,559		3
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation			98			98
Stock-based compensation (in shares)	5,979
Net loss					(398)	(398)
Ending Balance at Jun. 30, 2018			152,411	$ (264)	(143,694)	8,453
Ending Balance (in shares) at Jun. 30, 2018	2,010,025	5,559		3
Beginning Balance at Dec. 31, 2018			152,445	$ (264)	(140,083)	12,098
Beginning Balance (in shares) at Dec. 31, 2018	2,010,025	5,559		3
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock and prefunded common stock warrants, net of offering cost			787			787
Issuance of common stock and prefunded common stock warrants, net of offering cost (in shares)	221,000
Exercise of prefunded common stock warrants
Exercise of prefunded common stock warrants (in shares)	$ 201,961
Exchange of common shares for prefunded warrants
Exchange of common shares for prefunded warrants (iin shares)	(115,269)
Fractional shares adjusted for reverse split
Fractional shares adjusted for reverse split (in shares)	3,371
Stock-based compensation			115			115
Net loss					(1,793)	(1,793)
Ending Balance at Jun. 30, 2019			153,347	$ (264)	(141,876)	11,207
Ending Balance (in shares) at Jun. 30, 2019	2,321,088	5,559		3
Beginning Balance at Mar. 31, 2019			152,451	$ (264)	(141,232)	10,955
Beginning Balance (in shares) at Mar. 31, 2019	2,010,025	5,559		3
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock and prefunded common stock warrants, net of offering cost			787			787
Issuance of common stock and prefunded common stock warrants, net of offering cost (in shares)	221,000
Exercise of prefunded common stock warrants
Exercise of prefunded common stock warrants (in shares)	$ 201,961
Exchange of common shares for prefunded warrants
Exchange of common shares for prefunded warrants (iin shares)	(115,269)
Fractional shares adjusted for reverse split
Fractional shares adjusted for reverse split (in shares)	3,371
Stock-based compensation			109			109
Net loss					(644)	(644)
Ending Balance at Jun. 30, 2019			$ 153,347	$ (264)	$ (141,876)	$ 11,207
Ending Balance (in shares) at Jun. 30, 2019	2,321,088	5,559		3