Annual report pursuant to Section 13 and 15(d)

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

v3.8.0.1
Merger and Acquisition - Schedule of Unaudited Pro Forma Results (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Business Combinations [Abstract]    
Pro forma net loss $ (235,201) $ (100,734)
Pro forma net loss per basic share $ (1.24) $ (0.98)
Pro forma basic and diluted weighted average common shares outstanding 189,246 102,281