Consolidated Statements of Stockholders' Equity (Unaudited) (USD $) In Thousands	Total	Common Stock	Additional paid-in capital	Accumulated other comprehensive loss	Accumulated income
Beginning balance at Dec. 31, 2010	$ 218,265	$ 35	$ 201,702	$ (10)	$ 16,538
Beginning balance, shares at Dec. 31, 2010		34,971
Exercise of common stock options, shares		7
Exercise of common stock options	12		12
Non cash compensation recognized on stock options and ESPP	934		934
Restricted stock grants, net of cancellations, shares		717
Restricted stock grants, net of cancellations	3,042	1	3,041
Cancellation of shares for payment of withholding tax, shares		(22)
Cancellation of shares for payment of withholding tax	(259)		(259)
Employee stock purchase plan (ESPP), shares		43
Employee stock purchase plan (ESPP)	345		345
Excess tax benefits from stock-based compensation	157		157
Other comprehensive income (loss):
Unrealized loss on short-term investments	(1)			(1)
Net loss	(15,600)				(15,600)
Total comprehensive loss	(15,601)
Ending balance at Jun. 30, 2011	$ 206,895	$ 36	$ 205,932	$ (11)	$ 938
Ending balance, shares at Jun. 30, 2011		35,716