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Net Loss Per Share - Computation of Basic and Diluted Earnings Per Share (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Earnings Per Share [Abstract]        
Net loss $ (45,281) $ (33,273) $ (130,857) $ (97,573)
Less: Participation rights of the Forward Transactions 0 0 0 0
Net loss attributable to common stock $ (45,281) $ (33,273) $ (130,857) $ (97,573)
Weighted-average common shares outstanding-basic and diluted 79,543 79,003 79,340 78,864
Net loss attributable to common stock per share-basic and diluted $ (0.57) $ (0.42) $ (1.65) $ (1.24)