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Summary of Significant Accounting Policies - Additional Information 2 (Detail)
$ / shares in Units, $ in Thousands
 1 Months Ended 2 Months Ended 3 Months Ended 7 Months Ended 9 Months Ended
Aug. 13, 2018
USD ($)
$ / shares
shares
Sep. 30, 2018
USD ($)
Unit
$ / shares
$ / EquityUnit
shares
Sep. 30, 2017
USD ($)
Aug. 13, 2018
USD ($)
shares
Sep. 30, 2018
USD ($)
Product
shares
Sep. 30, 2017
USD ($)
Dec. 31, 2017
shares
Operations And Summary Of Significant Accounting Policies [Line Items]              
Stock-based compensation expense recognized   $ 329          
Number of primary products | Product         2    
Contract cash settlement max days         25 days    
Contract cancellable notice term         30 days    
Accounts Receivable related to satisfied performance obligations and unconditional right to consideration   $ 61,000     $ 61,000    
Restricted Stock              
Operations And Summary Of Significant Accounting Policies [Line Items]              
Number of shares granted | shares   422,545          
Restricted stock grant date fair value   $ 3,700          
Grant date fair value of share units, per share | $ / shares   $ 8.70          
Shares of unvested restricted stock outstanding | shares   422,545     422,545    
Unrecognized compensation cost related to unvested restricted stock   $ 3,500     $ 3,500    
Period in which compensation cost expected to be recognized         2 years 10 months 24 days    
Potential Performance Shares (PSU)              
Operations And Summary Of Significant Accounting Policies [Line Items]              
Shares of unvested restricted stock outstanding | shares   1,028,672     1,028,672    
Period in which compensation cost expected to be recognized         2 years 10 months 24 days    
Number of units granted | Unit   335,545          
Performance share units grant date fair value   $ 4,300          
Grant date fair value of share units, per unit | $ / EquityUnit   12.93          
Minimum final number of shares of common stock issuable based on performance multiplier | shares   0          
Maximum final number of shares of common stock issuable based on performance multiplier | shares   671,090          
Unrecognized expense, performance share units         $ 4,200    
Predecessor              
Operations And Summary Of Significant Accounting Policies [Line Items]              
Stock-based compensation expense recognized       $ 3,912   $ 4,455  
Predecessor | Restricted Stock              
Operations And Summary Of Significant Accounting Policies [Line Items]              
Number of shares granted | shares 100,226            
Restricted stock grant date fair value $ 900            
Grant date fair value of share units, per share | $ / shares $ 8.73            
Shares of unvested restricted stock outstanding | shares 904,181     904,181     619,867
General and Administrative Expense              
Operations And Summary Of Significant Accounting Policies [Line Items]              
Stock-based compensation expense recognized   $ 300          
General and Administrative Expense | Predecessor              
Operations And Summary Of Significant Accounting Policies [Line Items]              
Stock-based compensation expense recognized $ 800   $ 1,700     $ 4,500