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Fair Value Measurements - Estimated Fair Value and Carrying Value of Long-term Debt (Details) - Successor - USD ($)
Dec. 31, 2017
Dec. 31, 2016
Oct. 01, 2016
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Carrying Value $ 37,502,000 $ 305,308,000  
Convertible Debt | Convertible Notes      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Face amount of debt instrument     $ 281,800,000
Fair Value     445,700,000
Carrying Value 0 268,780,000  
Secured Debt | Building Note      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Face amount of debt instrument     35,000,000.0
Fair Value     $ 36,600,000
Carrying Value 37,502,000 36,528,000  
Level 2 | Convertible Debt | Convertible Notes      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Fair Value 0 334,800,000  
Level 2 | Secured Debt | Building Note      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Fair Value $ 42,526,000 $ 40,608,000