CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Treasury Stock [Member]	Accumulated Deficit [Member]
Balance at Dec. 31, 2013	$ 72,519	$ 23	$ 314,405	$ (1,380)	$ (240,529)
Balance (in shares) at Dec. 31, 2013		23,125,565		112,350
Stock based compensation	2,836	$ 0	2,836	$ 0	0
Issuance of shares of common stock for the cashless exercise of stock options	0	$ 0	0	$ 0	0
Issuance of shares of common stock for the cashless exercise of stock options (in shares)		72,910		0
Exercise of stock options to purchase common stock stock for cash ($1.56 to $9.60 per share)	147	$ 0	147	$ 0	0
Exercise of stock options to purchase common stock stock for cash ($1.56 to $9.60 per share) (in shares)		23,334		0
Issuance of 562,222 shares of common stock for the cashless exercise of 562,523 Series A Warrants	0	$ 1	(1)	$ 0	0
Issuance of 562,222 shares of common stock for the cashless exercise of 562,523 Series A Warrants (in shares)		562,222		0
Issuance of 329,753 shares of common stock for the cashless exercise of 380,101 Series B Warrants	0	$ 0	0	$ 0	0
Issuance of 329,753 shares of common stock for the cashless exercise of 380,101 Series B Warrants (in shares)		329,753		0
Net loss	(25,088)	$ 0	0	$ 0	(25,088)
Balance at Sep. 30, 2014	50,414	$ 24	317,387	$ (1,380)	(265,617)
Balance (in shares) at Sep. 30, 2014		24,113,784		112,350
Balance at Dec. 31, 2014	44,017	$ 24	318,437	$ (1,380)	(273,064)
Balance (in shares) at Dec. 31, 2014		24,388,523		112,350
Stock based compensation	2,925	$ 0	2,925	$ 0	0
Exercise of 37,093 Series A warrants to purchase common stock for cash @ $0.01 per share	0	$ 0	0	$ 0	0
Exercise of 37,093 Series A warrants to purchase common stock for cash @ $0.01 per share (in shares)		37,093		0
Issuance of shares of common stock for the cashless exercise of stock options	0	$ 0	0	$ 0	0
Issuance of shares of common stock for the cashless exercise of stock options (in shares)		4,845		0
Net loss	(22,921)	$ 0	0	$ 0	(22,921)
Balance at Sep. 30, 2015	$ 24,021	$ 24	$ 321,362	$ (1,380)	$ (295,985)
Balance (in shares) at Sep. 30, 2015		24,430,461		112,350