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Related-Party Arrangements - Additional Information (Detail)
3 Months Ended
Mar. 11, 2018
USD ($)
$ / shares
shares
Mar. 31, 2019
USD ($)
$ / shares
shares
Mar. 31, 2018
USD ($)
Dec. 31, 2018
USD ($)
$ / shares
shares
Related Party Transaction [Line Items]        
Principal amount   $ 101,700,000    
Loss on extinguishment of debt     $ 825,000  
Common stock, shares issued | shares   187,778,236   187,029,967
Common stock, par value | $ / shares   $ 0.01   $ 0.01
The Mann Group LLC        
Related Party Transaction [Line Items]        
Loss on extinguishment of debt     $ 800,000  
Unamortized premium       $ 800,000
Debt issuance costs       100,000
The Mann Group LLC | Amended and Restated Loan Arrangement        
Related Party Transaction [Line Items]        
Principal amount $ 71,500,000      
Maturity date Jul. 01, 2021      
No of convertible shares 250      
Principal amount per share | $ / shares $ 1,000      
Conversion price of shares | $ / shares $ 4.00      
The Mann Group LLC | Loan Arrangement        
Related Party Transaction [Line Items]        
Common stock, shares issued | shares 3,000,000      
Common stock, par value | $ / shares $ 2.72      
Principal balance cancelled amount $ 8,200,000      
Fixed borrowing rate   5.84%    
Related party transaction prepayment period   90 days    
Aggregate principal amount cancelled   $ 105,000,000    
Accrued interest of related party debt   8,000,000   6,800,000
Amount available for future borrowings   0   0
The Mann Group LLC | Loan Arrangement | Maximum        
Related Party Transaction [Line Items]        
Amount prepaid for cancellation of indebtedness   $ 200,000,000    
The Mann Group LLC | Loan Arrangement | Minimum        
Related Party Transaction [Line Items]        
Number of months advances outstanding   12 months    
Related Party Debt        
Related Party Transaction [Line Items]        
Principal amount   $ 71,506,000   71,506,000
Unamortized premium   581,000   639,000
Debt issuance costs   $ 51,000   $ 56,000
Related Party Debt | Letter Agreement        
Related Party Transaction [Line Items]        
Description of variable rate interest   the interest rate will increase to the one-year LIBOR calculated on the date of the initial advance or in effect on the date of default, whichever is greater, plus 5% per annum.    
Related Party Debt | Letter Agreement | LIBOR        
Related Party Transaction [Line Items]        
Interest rate (LIBOR)   5.00%