Quarterly report pursuant to Section 13 or 15(d)

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

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Net Loss Per Common Share - Calculation of Basic and Diluted Net Loss Per Share (Detail) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Numerator        
Net loss $ (6,175) $ (4,711) $ (18,231) $ (12,081)
Denominator        
Weighted average common shares outstanding—basic and diluted 39,119,606 36,005,294 38,848,660 35,953,234
Basic and diluted net loss per common share $ (0.16) $ (0.13) $ (0.47) $ (0.34)