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Net Loss Per Share - Computation of Basic and Diluted Loss Per Share Attributable to Common Stockholders (Detail) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Numerator:    
Net loss $ (28,008) $ (23,467)
Denominator:    
Weighted average common shares outstanding - basic and diluted 47,343,234 33,466,955
Net loss per share - basic and diluted $ (0.59) $ (0.70)