Consolidated Statement of Stockholders' Equity (USD $) In Thousands	Total	Common stock [Member]	Additional paid-in capital [Member]	Accumulated comprehensive deficit [Member]
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	133		133
Restricted stock grants, net of cancellations	2,614	1	2,613
Restricted stock grants, net of cancellations, shares		1,186
Cancellation of shares for payment of withholding tax	(81)		(81)
Cancellation of shares for payment of withholding tax, shares		(64)
Employee stock purchase plan (ESPP)	36		36
Employee stock purchase plan (ESPP), shares		38
Comprehensive loss	(26,447)			(26,447)
BALANCE at Sep. 30, 2013	$ 18,917	$ 37	$ 213,866	$ (194,986)
BALANCE, Shares at Sep. 30, 2013		37,033