Consolidated Statements of Stockholders' Equity (USD $) In Thousands	Total	Common stock [Member]	Additional paid-in capital [Member]	Accumulated comprehensive income (deficit) [Member]
BALANCE at Dec. 31, 2010	$ 218,265	$ 35	$ 201,702	$ 16,528
BALANCE, Shares at Dec. 31, 2010		34,971
Exercise of common stock options	12		12
Exercise of common stock options, shares	7	7
Non cash compensation recognized on stock options and ESPP	973		973
Restricted stock grants, net of cancellations	5,557	1	5,556
Restricted stock grants, net of cancellations, shares		575
Cancellation of shares for payment of withholding tax	(303)		(303)
Cancellation of shares for payment of withholding tax, shares		(37)
Employee stock purchase plan	413		413
Employee stock purchase plan, shares		96
Tax benefit deficiencies related to restricted stock expense	(426)		(426)
Comprehensive loss	(159,631)			(159,631)
BALANCE at Dec. 31, 2011	64,860	36	207,927	(143,103)
BALANCE, Shares at Dec. 31, 2011		35,612
Exercise of common stock options	16		16
Exercise of common stock options, shares	32	32
Non cash compensation recognized on stock options and ESPP	66		66
Restricted stock grants, net of cancellations	3,883		3,883
Restricted stock grants, net of cancellations, shares		574
Cancellation of shares for payment of withholding tax	(40)		(40)
Cancellation of shares for payment of withholding tax, shares		(23)
Employee stock purchase plan	66		66
Employee stock purchase plan, shares		53
Shares repurchased and cancelled	(753)		(753)
Shares repurchased and cancelled, shares		(375)
Comprehensive loss	(25,436)			(25,436)
BALANCE at Dec. 31, 2012	42,662	36	211,165	(168,539)
BALANCE, Shares at Dec. 31, 2012		35,873
Non cash compensation recognized on stock options and ESPP	168		168
Restricted stock grants, net of cancellations	3,365	1	3,364
Restricted stock grants, net of cancellations, shares		1,179
Cancellation of shares for payment of withholding tax	(114)		(114)
Cancellation of shares for payment of withholding tax, shares		(96)
Employee stock purchase plan	36		36
Employee stock purchase plan, shares		38
Comprehensive loss	(27,946)			(27,946)
BALANCE at Dec. 31, 2013	$ 18,171	$ 37	$ 214,619	$ (196,485)
BALANCE, Shares at Dec. 31, 2013		36,994