Consolidated Statements of Changes in Stockholders' Equity - 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, 2014			$ 137,658	$ (264)	$ (83,808)	$ 53,586
Beginning Balance (in shares) at Dec. 31, 2014	1,505,761	444,603		12
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance common shares in July Financing, net of offering cost			337			337
Issuance common shares in July Financing, net of offering cost (in shares)	301,026
Issuance of common stock and Series K convertible preferred stock in December Offering, net of offering cost			1,202			1,202
Issuance of common stock and Series K convertible preferred stock in December Offering, net of offering cost (in shares)	726,315	1,240
Beneficial conversion feature of Series K convertible preferred stock			323			323
Deemed dividend related to immediate accretion of beneficial conversion feature of convertible preferred stock			(323)			(323)
Extinguishment of Series H convertible preferred stock and deemed capital contribution			(4,766)			(4,766)
Extinguishment of Series H convertible preferred stock and deemed capital contribution (in shares)		(57,076)
Deemed capital contribution on extinguishment of preferred stock			9,485			9,485
Cancellation of Series C preferred stock
Cancellation of Series C preferred stock (in shares)		(1)
Fractional shares adjusted for reverse split
Fractional shares adjusted for reverse split (in shares)	(117)
Stock-based compensation			371			371
Stock-based compensation (in shares)	6,862
Net Loss					(51,465)	(51,465)
Ending Balance at Dec. 31, 2015			144,287	$ (264)	(135,273)	8,750
Ending Balance (in shares) at Dec. 31, 2015	2,539,847	388,766		12
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Conversion of Series K preferred stock to common stock
Conversion of Series K preferred stock to common stock (in shares)	326,315	(1,240)
Beneficial conversion feature of Series K convertible preferred stock			695			695
Deemed dividend on conversion of Series K convertible preferred stock to common stock			(695)			(695)
Extinguishment of Series H convertible preferred stock and deemed capital contribution			(414)			(414)
Extinguishment of Series H convertible preferred stock and deemed capital contribution (in shares)		(381,967)
Deemed capital contribution on extinguishment of preferred stock						31,480
Fractional shares adjusted for reverse split			(4)			(4)
Fractional shares adjusted for reverse split (in shares)	(1,675)
Warrant Exercise			760			760
Warrant Exercise (in shares)	200,000
Issuance common stock in equity raise, net of offering cost			2,140			2,140
Issuance common stock in equity raise, net of offering cost (in shares)	1,592,357
Stock-based compensation			562			562
Stock-based compensation (in shares)	287,085
Net Loss					(6,476)	(6,476)
Ending Balance at Dec. 31, 2016			$ 147,331	$ (264)	$ (141,749)	$ 5,318
Ending Balance (in shares) at Dec. 31, 2016	4,943,929	5,559		12