Consolidated Statements of Shareholders' Equity - USD ($) $ in Thousands	Total	Series F Convertible Preferred Stock [Member]	Preferred Stock [Member] Series C-1 Convertible Preferred Stock [Member]	Preferred Stock [Member] Series C Two Convertible Preferred Stock [Member]	Preferred Stock [Member] Series D One Convertible Preferred Stock [Member]	Preferred Stock [Member] Series F Convertible Preferred Stock [Member]	Common Stock [Member]	Common Stock [Member] Series C-1 Convertible Preferred Stock [Member]	Common Stock [Member] Series F Convertible Preferred Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Conversion of Series F Preferred Stock into Common Stock [Member]	Conversion of Series F Preferred Stock into Common Stock [Member] Preferred Stock [Member] Series F Convertible Preferred Stock [Member]	Conversion of Series F Preferred Stock into Common Stock [Member] Common Stock [Member]	Conversion of Series F Preferred Stock into Common Stock [Member] Additional Paid-in Capital [Member]	Conversion Of Series C-1 And D-1 Preferred Stock Into Common Stock [Member]	Conversion Of Series C-1 And D-1 Preferred Stock Into Common Stock [Member] Preferred Stock [Member] Series C-1 Convertible Preferred Stock [Member]	Conversion Of Series C-1 And D-1 Preferred Stock Into Common Stock [Member] Preferred Stock [Member] Series D One Convertible Preferred Stock [Member]	Conversion Of Series C-1 And D-1 Preferred Stock Into Common Stock [Member] Common Stock [Member]	Conversion Of Series C-1 And D-1 Preferred Stock Into Common Stock [Member] Additional Paid-in Capital [Member]
Beginning Balance, shares at Dec. 31, 2012			6,000	1,000	5,000	0	285,000
Beginning Balance at Dec. 31, 2012	$ 3,214		$ 5,792	$ 500	$ 4,615	$ 0	$ 1			$ 439,672	$ (447,366)
Issuance of Series C-1 & C-2 Convertible Preferred Stock dividends, shares			1,000
Issuance of Series C-1 & C-2 Convertible Preferred Stock dividends	0		$ 744	$ 57						(801)
Conversion of Convertible Preferred Stock into common stock, shares																	(1,000)		(367,000)
Conversion of Convertible Preferred Stock into common stock																$ 0	$ (77)	$ (47)		$ 124
Redemption of Series D-1 Convertible Preferred Stock, shares					5,000
Redemption of Series D-1 Convertible Preferred Stock	0				$ 4,568					(4,568)
Exchange of Series C-2 Convertible Preferred Stock for Series C-1 Convertible Preferred Stock, shares			(1,000)	(1,000)
Exchange of Series C-2 Convertible Preferred Stock for Series C-1 Convertible Preferred Stock	0		$ 557	$ (557)
Stock issued during period, shares						3,000	1,929,000
Stock issued during period, value	6,750	$ 3,250				$ 3,250	$ 2			6,748
Share-based compensation expense	12,373									12,373
Issuance of restricted stock awards, shares							1,823,000
Issuance of restricted stock awards	1						$ 1
Net loss	(17,935)										(17,935)
Ending Balance, shares at Dec. 31, 2013			7,000	0	0	3,000	4,404,000
Ending Balance at Dec. 31, 2013	7,653		$ 7,016	$ 0	$ 0	$ 3,250	$ 4			462,684	(465,301)
Adjustment for reverse stock split	0						$ (4)			4
Conversion of Convertible Preferred Stock into common stock, shares														(129,000)			(3,000)		(5,342,000)
Conversion of Convertible Preferred Stock into common stock												$ 0	$ (452)		$ 452	0	$ (3,099)		$ 1	3,098
Stock issued during period, shares							5,395,000	5,341,670	129,105
Stock issued during period, value	53,063						$ 1			53,062
Share-based compensation expense	8,992									8,992
Third party share-based compensation expense	$ 63									63
Exercise of stock options for common stock, shares	0
Common stock issued for services, shares							3,000
Common stock issued for services	$ 25									25
Restricted stock awards canceled, shares							47,000
Restricted stock awards canceled	27									27
Net loss	(21,313)										(21,313)
Ending Balance, shares at Dec. 31, 2014			4,000	0	0	3,000	15,226,000
Ending Balance at Dec. 31, 2014	48,456		$ 3,917	$ 0	$ 0	$ 2,798	$ 2			528,353	(486,614)
Conversion of Convertible Preferred Stock into common stock, shares														(17,000)					(19,000)
Conversion of Convertible Preferred Stock into common stock												$ 0	$ (61)		$ 61	$ 0	$ (11)			$ 11
Stock issued during period, shares							2,933,000	19,134	17,360
Stock issued during period, value	104,596									104,596
Share-based compensation expense	11,551									11,551
Third party share-based compensation expense	$ 1,521									1,521
Exercise of stock options for common stock, shares	51,814						45,000
Exercise of stock options for common stock	$ 315									315
Issuance of restricted stock awards, shares							4,000
Issuance of restricted stock awards	0
Net loss	(41,912)										(41,912)
Ending Balance, shares at Dec. 31, 2015			4,000	0	0	3,000	18,244,000
Ending Balance at Dec. 31, 2015	$ 124,527		$ 3,906	$ 0	$ 0	$ 2,737	$ 2			$ 646,408	$ (528,526)