UNAUDITED CONSOLIDATED STATEMENT OF STOCKHOLDERS' EQUITY (USD $) In Thousands, unless otherwise specified	Total	Preferred Stock	Common Stock	Treasury Stock	Additional Paid-in Capital	Accumulated Deficit
Balance at Dec. 31, 2013	$ 354,583	$ 0	$ 7	$ (10,311)	$ 519,625	$ (154,738)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exercise of stock options	428		1		427
Compensation under employee stock compensation plan	2,959				2,959
Net loss	(25,314)					(25,314)
Balance at Mar. 31, 2014	332,656	0	8	(10,311)	523,011	(180,052)
Balance at Dec. 31, 2014	216,805	0	8	(10,679)	529,682	(302,206)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of Series A convertible preferred stock and warrants	6,570				6,570
Accrued dividends on preferred stock	(453)				(453)
Deemed dividend on preferred stock	(1,164)				(1,164)
Compensation under employee stock compensation plan	2,179				2,179
Surrender of stock to satisfy minimum tax withholding	(36)			(36)
Net loss	(19,673)					(19,673)
Balance at Mar. 31, 2015	$ 204,228	$ 0	$ 8	$ (10,715)	$ 536,814	$ (321,879)