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Net Loss Per Share - Schedule of Computation of Basic and Diluted Net Loss Per Share Attributable to Common Stockholders (Detail) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Numerator:        
Net loss $ (4,932) $ (11,134) $ (21,631) $ (21,588)
Accretion of redeemable preferred stock   (13)   (39)
Net loss attributable to common stockholders $ (4,932) $ (11,147) $ (21,631) $ (21,627)
Denominator:        
Weighted average common shares outstanding - basic and diluted 14,654,427 187,044 5,860,758 186,792
Net loss per share attributable to common stockholders - basic and diluted $ (0.34) $ (59.60) $ (3.69) $ (115.78)