Consolidated Statements Of Comprehensive Loss (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Net loss	$ (5,500)	$ (9,474)	$ (5,060)	$ (17,926)
Other comprehensive loss:
Change in unrealized gain (loss) on available-for-sale securities, net	10	(2)	(10)	(2)
Other comprehensive income (loss), net	10	(2)	(10)	(2)
Comprehensive loss	$ (5,490)	$ (9,476)	$ (5,070)	$ (17,928)