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Earnings Per Share - Schedule of Earnings Per Share Basic and Diluted (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Numerator        
Net loss: $ (8,832) $ (5,093) $ (35,228) $ (22,107)
Denominator        
Weighted-average common shares outstanding 38,167 34,070 35,568 33,902
Basic and diluted net loss per share $ (0.23) $ (0.15) $ (0.99) $ (0.65)