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Net Loss Per Share - Summary of Basic and Diluted Net Loss Per Share (Detail) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Numerator:    
Net loss $ (56,778) $ (30,543)
Denominator:    
Weighted average common stock outstanding—basic 37,269,148 31,643,216
Dilutive effect of shares of common stock equivalents resulting from common stock options and restricted stock units 0 0
Weighted average common stock outstanding—diluted 37,269,148 31,643,216
Net loss per share—basic and diluted $ (1.52) $ (0.97)