Consolidated Statements of Changes in Stockholders' Equity - USD ($) $ in Thousands	Common Stock	Preferred Stock	Additional Paid-In Capital	Treasury Stock	Accumulated Deficit	Total
Beginning Balance, Amount at Dec. 31, 2013			$ 102,043	$ (465)	$ (53,276)	$ 48,302
Beginning Balance, Shares at Dec. 31, 2013	198,406	1,902,142		21
Issuance of common stock for cash, net, Amount			3,874			3,874
Issuance of common stock for cash, net, Shares	62,401
Issuance of common stock for non-cash registration rights penalty, Amount			654			654
Issuance of common stock for non-cash registration rights penalty, Shares	12,606
Issuance of common stock for contractual dispute settlement, Amount			225			(225)
Issuance of common stock for contractual dispute settlement, Shares	6,579
Issuance of Series J preferred stock for cash, net, Amount		$ 1	18,386			18,387
Issuance of Series J preferred stock for cash, net, Shares		10,000,000
Conversion of Series B preferred stock to common stock, Shares		(1)
Conversion of Series D preferred stock to common stock, Shares	674,362	(1,281,288)
Conversion of Series F preferred stock to common stock, Shares	8,224	(156,250)
Conversion of Series H preferred stock to common stock, Shares	10,526	(20,000)
Conversion of Series J preferred stock to common stock, Amount		$ (1)	1
Conversion of Series J preferred stock to common stock, Shares	526,316	(10,000,000)
Retirement of treasury stock, Amount			(201)	$ 201
Retirement of treasury stock, Shares				(9)
Stock-based compensation, Amount			12,676			12,676
Stock-based compensation, Shares	6,341
Net Loss					(30,532)	(30,532)
Ending Balance, Amount at Dec. 31, 2014			137,658	$ (264)	(83,808)	$ 53,586
Ending Balance, Shares at Dec. 31, 2014	1,505,761	444,603		12
Issuance of common stock for contractual dispute settlement, Amount
Issuance common shares in July Financing, net of offering cost, Amount			337			$ 337
Issuance common shares in July Financing, net of offering cost, Shares	301,026
Issuance of common stock and Series K convertible preferred stock in December Offering, net of offering cost, Amount			1,202			1,202
Issuance of common stock and Series K convertible preferred stock in December Offering, net of offering cost, Shares	726,315	1,240
Beneficial conversion feature of convertible preferred stock			323			323
Deemed dividend related to immediate accretion of beneficial conversion feature of convertible preferred stock, Amount			(323)			(323)
Extinguishment of Series H convertible preferred stock and deemed capital contribution, Amount			(4,766)			(4,766)
Extinguishment of Series H convertible preferred stock and deemed capital contribution, Shares		(57,076)
Deemed capital contribution on extinguishment of preferred stock			9,485			9,485
Cancellation of Series C preferred stock		(1)
Fractional shares adjusted for reverse split	(117)
Stock-based compensation, Amount			371			371
Stock-based compensation, Shares	6,862
Net Loss					(51,465)	(51,465)
Ending Balance, Amount at Dec. 31, 2015			$ 144,287		$ (135,273)	$ 8,750
Ending Balance, Shares at Dec. 31, 2015	2,539,847	388,766		12