Condensed Consolidated Statements of Stockholders' Equity (USD $) In Thousands, except Share data, unless otherwise specified	Total	Common Stock	Preferred Stock	Treasury Stock	Additional Paid-in Capital	Accumulated Other Comprehensive Income (Loss)	Retained Earnings (Accumulated Deficit)
Beginning balance at Dec. 31, 2009	$ 27,196	$ 2	$ 6,943	$ (545)	$ 84,020	$ 118	$ (63,342)
Beginning balance, shares at Dec. 31, 2009		24,168,000	16,000	346,000
Increase (Decrease) in Stockholders' Equity
Net income (loss)	(43,465)						(43,465)
Foreign currency translation adjustment	(21)					(21)
Common stock issued in payment of debt issuance costs	5,096	1			5,095
Common stock issued in payment of debt issuance costs, shares		4,042,000
Common stock issued in exchange of convertible notes	1,992				1,992
Common stock issued in exchange of convertible notes, shares		1,569,000
Accretion of discount on preferred stock			5,132				(5,132)
Preferred stock dividends, net of forfeitures	(1,411)						(1,411)
Stock warrants exercised	4,453	1			4,452
Stock warrants exercised, shares		3,923,000
Fair value of warrant liability reclassified to additional paid-in capital	0
Stock options exercised	114				114
Stock options exercised, shares		140,000
Restricted stock granted, shares		827,000
Restricted stock forfeited, shares				23,000
Treasury stock purchased	(347)			(347)
Treasury stock purchased, shares				196,000
Excess tax benefit related to share-based awards	(1,744)				(1,744)
Stock compensation expense	4,684				4,684
Conversion of preferred stock into common stock			(4,795)		4,795
Conversion of preferred stock into common stock, shares		(2,085,000)	(5,000)
Ending balance at Dec. 31, 2010	(3,453)	4	7,280	(892)	103,408	97	(113,350)
Ending balance, shares at Dec. 31, 2010		36,754,000	11,000	565,000
Increase (Decrease) in Stockholders' Equity
Net income (loss)	31,408						31,408
Foreign currency translation adjustment	(141)					(141)
Common stock issued in payment of debt issuance costs	0
Common stock issued in exchange of convertible notes	0
Sale of common stock, net of issuance cost	29,438				29,438
Sale of common stock, net of issuance cost, shares	3,665,000	3,665,000
Common stock issued in payment of term loan debt	1,398				1,398
Common stock issued in payment of term loan debt, shares	171,154	171,000
Common stock issued in payment of convertible notes	5,165				5,165
Common stock issued in payment of convertible notes, shares	559,007	559,000
Accretion of discount on preferred stock			3,925				(3,925)
Common stock issued in payment of preferred stock dividends	3,254				3,254
Common stock issued in payment of preferred stock dividends, shares	624,171	624,000
Preferred stock dividends, net of forfeitures	(943)						(943)
Stock warrants exercised	4,793				4,793
Stock warrants exercised, shares	3,960,747	3,961,000
Fair value of warrant liability reclassified to additional paid-in capital	0
Stock options exercised	147				147
Stock options exercised, shares	64,232	64,000
Restricted stock granted, shares	1,287,731	1,288,000
Restricted stock forfeited, shares				11,000
Treasury stock purchased	(775)			(775)
Treasury stock purchased, shares	57,303			81,000
Excess tax benefit related to share-based awards	570				570
Stock compensation expense	7,437				7,437
Conversion of preferred stock into common stock		1	(11,205)		11,204
Conversion of preferred stock into common stock, shares	(4,871,719)	(4,872,000)	(11,000)
Return of borrowed shares under share lending agreement				701,000
Ending balance at Dec. 31, 2011	78,298	5		(1,667)	166,814	(44)	(86,810)
Ending balance, shares at Dec. 31, 2011		51,958,000		1,358,000
Increase (Decrease) in Stockholders' Equity
Net income (loss)	49,791						49,791
Other comprehensive income (loss)	4					4
Common stock issued in payment of debt issuance costs	0
Sale of common stock, net of issuance cost, shares	0
Common stock issued in payment of term loan debt, shares	0
Common stock issued in payment of convertible notes, shares	0
Common stock issued in payment of preferred stock dividends, shares	0
Stock warrants exercised	421				421
Stock warrants exercised, shares	348,350	348,000
Fair value of warrant liability reclassified to additional paid-in capital	13,973				13,973
Stock options exercised	167				167
Stock options exercised, shares	67,500	68,000
Restricted stock granted, shares	750,476	750,000
Restricted stock forfeited, shares				30,000
Treasury stock purchased	(2,034)			(2,034)
Treasury stock purchased, shares	166,334			166,000
Excess tax benefit related to share-based awards	528				528
Employee stock purchase plan	161				161
Employee stock purchase plan, shares				(15,000)
Stock compensation expense	13,421				13,421
Conversion of preferred stock into common stock, shares	0
Return of borrowed shares under share lending agreement				659,000
Ending balance at Dec. 31, 2012	$ 154,730	$ 5	$ 0	$ (3,701)	$ 195,485	$ (40)	$ (37,019)
Ending balance, shares at Dec. 31, 2012		53,124,000	0	2,198,000