Quarterly report pursuant to Section 13 or 15(d)

Merger and Acquisition - Schedule of Unaudited Pro Forma Results (Detail)

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Merger and Acquisition - Schedule of Unaudited Pro Forma Results (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
Business Combinations [Abstract]        
Pro forma net loss $ (22,864) $ (45,874) $ (200,478) $ (80,086)
Pro forma net loss per basic share $ (0.12) $ (0.36) $ (1.07) $ (0.89)
Pro forma basic and diluted weighted average common shares outstanding 192,411 126,641 187,127 90,492