Quarterly report pursuant to Section 13 or 15(d)

Net Loss Per Common Share - Calculation of Basic and Diluted Net Loss Per Share (Detail)

v2.4.0.8
Net Loss Per Common Share - Calculation of Basic and Diluted Net Loss Per Share (Detail) (USD $)
In Thousands, except 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 $ (4,592) $ (7,832) $ (16,673) $ (27,360)
Denominator:        
Weighted-average common shares outstanding—denominator for basic and diluted net loss per share 36,024,810 32,634,683 35,977,355 28,664,822
Basic and diluted net loss per common share $ (0.13) $ (0.24) $ (0.46) $ (0.95)