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	$ (4,971)	$ (9,175)	$ (14,774)	$ (18,212)
Other comprehensive gain (loss):
Unrealized gain (loss) on investment securities, available-for-sale	(2)	(3)	3	(4)
Less: reclassification adjustment for losses realized in net loss	32	0	32	0
Comprehensive loss	$ (4,941)	$ (9,178)	$ (14,739)	$ (18,216)