CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Treasury Stock	Accumulated Deficit
Beginning Balance at Dec. 31, 2013	$ 72,519	$ 23	$ 314,405	$ (1,380)	$ (240,529)
Beginning Balance (in shares) at Dec. 31, 2013		23,125,565		112,350
Stock based compensation	1,875	$ 0	1,875	$ 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
Net loss	(17,537)	$ 0	0	$ 0	(17,537)
Ending Balance at Jun. 30, 2014	57,004	$ 23	316,427	$ (1,380)	(258,066)
Ending Balance (in shares) at Jun. 30, 2014		23,221,809		112,350
Beginning Balance at Dec. 31, 2014	44,017	$ 24	318,437	$ (1,380)	(273,064)
Beginning Balance (in shares) at Dec. 31, 2014		24,388,523		112,350
Stock based compensation	2,043	$ 0	2,043	$ 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)		4,845		0
Net loss	(16,316)	$ 0	0	$ 0	(16,316)
Ending Balance at Jun. 30, 2015	$ 29,744	$ 24	$ 320,480	$ (1,380)	$ (289,380)
Ending Balance (in shares) at Jun. 30, 2015		24,393,368		112,350