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 |
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| 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 |
| X | ||||||||||
- Definition Weighted average basic and diluted shares outstanding pro forma. No definition available.
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| X | ||||||||||
- Definition The pro forma basic net income per share for a period as if the business combination or combinations had been completed at the beginning of a period. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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| X | ||||||||||
- Definition The pro forma net Income or Loss for the period as if the business combination or combinations had been completed at the beginning of a period. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- References No definition available.
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