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Comprehensive Loss (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Comprehensive Loss        
Net loss $ (4,500) $ (3,898) $ (42,421) $ (25,986)
Unrealized gain (loss) on cash equivalents and marketable securities, net of tax (7) 104 17 6
Comprehensive loss $ (4,507) $ (3,794) $ (42,404) $ (25,980)