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Summary of Significant Accounting Policies - Computation of Basic and Diluted Earnings 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 $ (17,756) $ (6,400) $ (31,228) $ (10,858)
Accretion of redeemable convertible preferred stock to redemption value   (43)   (92)
Net loss attributable to common stockholders $ (17,756) $ (6,443) $ (31,228) $ (10,950)
Denominator:        
Weighted average of common shares outstanding, basic and diluted 27,011,960 2,178,465 26,316,619 1,457,931
Net loss per share attributable to common stockholders, basic and diluted $ (0.66) $ (2.96) $ (1.19) $ (7.51)