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Equity (Details)
12 Months Ended
Jul. 31, 2017
warrants
$ / shares
shares
Nov. 28, 2016
USD ($)
shares
Nov. 15, 2016
shares
Dec. 31, 2016
USD ($)
shares
Dec. 31, 2017
warrants
$ / shares
shares
Aug. 07, 2017
$ / shares
Jul. 26, 2017
Oct. 15, 2016
Class of Stock [Line Items]                
Capital stock, shares authorized (in shares) 76,000,000.0              
Preferred stock, shares authorized (in shares) 1,000,000.0       1,000,000.0      
Preferred stock, par value (usd per share) | $ / shares $ 0.01       $ 0.001      
Common stock, shares authorized (in shares) 75,000,000.0       75,000,000      
Common stock, par value (usd per share) | $ / shares $ 0.01       $ 0.001      
Issuance of common stock for rights offering (in shares) 11,695,580              
Plan of reorganization, number of warrants issued | warrants 118,137       0      
Exercise price of warrants (in usd per warrant) | $ / shares $ 39.82       $ 39.82 $ 39.82    
Expiration term (in years) 7 years              
Conversion of stock (in shares)       101,071,875        
Back stop amount | $   $ 5,000,000.0            
Preferred stock, shares outstanding (in shares)         0      
Rights Offering and Backstop fee                
Class of Stock [Line Items]                
Issuance of common stock for rights offering (in shares)   20,312,500            
Rights Offering                
Class of Stock [Line Items]                
Issuance of common stock for rights offering (in shares)     19,500,000.0          
Backstop Fee                
Class of Stock [Line Items]                
Issuance of common stock for rights offering (in shares)     800,000.0          
2018 Notes                
Class of Stock [Line Items]                
Interest Rate         9.875%   9.875%  
2021 Notes                
Class of Stock [Line Items]                
Interest Rate         10.00%     12.50%
2021 Notes | Minimum                
Class of Stock [Line Items]                
Interest Rate         10.00%      
2021 Notes | Maximum                
Class of Stock [Line Items]                
Interest Rate         12.50%      
Chief Executive Officer                
Class of Stock [Line Items]                
Conversion of stock (in shares)       98,234,375        
Chief Executive Officer | 2018 Notes                
Class of Stock [Line Items]                
Aggregate principal amount of debt restructured | $       $ 31,400,000        
2021 Noteholders                
Class of Stock [Line Items]                
Issuance of common stock for rights offering (in shares) 7,900,000              
Note Holders                
Class of Stock [Line Items]                
Conversion of stock (in shares)       2,837,500        
Affected Classes                
Class of Stock [Line Items]                
Issuance of common stock for rights offering (in shares) 100,000              
Supporting Noteholder Term Loan Claims                
Class of Stock [Line Items]                
Issuance of common stock for rights offering (in shares) 3,695,580