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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 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Numerator:        
Net loss $ (14,897) $ (6,941) $ (16,699) $ (10,454)
Accretion of redeemable preferred stock   (13)   (26)
Net loss attributable to common stockholders $ (14,897) $ (6,954) $ (16,699) $ (10,480)
Denominator:        
Weighted average common shares outstanding-basic and diluted 5,608,429 3,145,521 4,401,087 3,145,283
Net loss per share attributable to common stockholders-basic and diluted $ (2.66) $ (2.21) $ (3.79) $ (3.33)