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Condensed Consolidated Statements of Comprehensive Loss (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Statement of Comprehensive Income [Abstract]        
Net loss $ (8,832) $ (5,093) $ (35,228) $ (22,107)
Unrealized gain (loss) on cash equivalents and marketable securities, net of tax (5) 14 (5) (24)
Total comprehensive loss $ (8,837) $ (5,079) $ (35,233) $ (22,131)