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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 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Numerator:        
Net loss $ (22,291) $ (25,721) $ (39,310) $ (53,729)
Denominator:        
Weighted average common shares outstanding - basic and diluted 52,824,483 47,403,243 50,206,470 47,373,404
Net loss per share - basic and diluted $ (0.42) $ (0.54) $ (0.78) $ (1.13)