Quarterly report pursuant to Section 13 or 15(d)

Long-Term Debt - 7.125% Senior Secured Notes - Additional Information (Detail)

v3.21.2
Long-Term Debt - 7.125% Senior Secured Notes - Additional Information (Detail) - USD ($)
9 Months Ended
Sep. 30, 2021
Sep. 10, 2021
Sep. 30, 2021
Dec. 31, 2020
Line of Credit Facility [Line Items]        
Debt Conversion, Converted Instrument, Rate 7.125%      
Accrued interest $ 2,750,000   $ 2,750,000 $ 1,225,000
Debt related commitment fees and debt issuance costs     6,300,000  
Debt Issuance Costs, Net   $ 4,200,000    
2024 Notes [member]        
Line of Credit Facility [Line Items]        
Debt Instrument, Debt Default, Amount   112,800,000    
Debt Conversion, Converted Instrument, Amount   112,800,000 112,800,000  
Interest expense, debt     6,600,000  
Accrued interest 2,300,000   2,300,000  
Debt Issuance Costs, Net   1,100,000    
2028 Notes [member]        
Line of Credit Facility [Line Items]        
Debt Conversion, Converted Instrument, Amount   $ 114,700,000 114,700,000  
Debt Conversion, Converted Instrument, Rate   7.125%    
Debt Instrument, Maturity Date   Jun. 01, 2028    
Debt Instrument, Payment Terms   Interest accrues on the 2028 Notes from September 10, 2021 and is payable semi-annually, in cash in arrears, on June 1 and December 1 of each year, commencing December 1, 2021.    
Debt Instrument, Frequency of Periodic Payment   semi-annually    
Interest expense, debt   $ 8,200    
Accrued interest $ 500   $ 500  
Debt Issuance Costs, Net   3,000,000.0    
Purchase Obligation   $ 50,000,000    
Percentage of call premium   1.688%    
Deferred withdrawn amount   $ 800,000    
2028 Notes [member] | Operating Expense [Member]        
Line of Credit Facility [Line Items]        
Third party debt modification costs   $ 2,300,000    
2028 Notes [member] | Debt Instrument Redemption Period Two [Member]        
Line of Credit Facility [Line Items]        
Debt Instrument, Interest Rate, Stated Percentage   7.125%    
Debt instrument, redemption price, percentage of principal amount redeemed   100.00%    
2028 Notes [member] | Debt Instrument Redemption Period Three [Member]        
Line of Credit Facility [Line Items]        
Debt instrument, redemption price, percentage of principal amount redeemed   107.125%    
Debt Instrument, Redemption , Percentage   35.00%    
2028 Notes [member] | Debt Instrument, Redemption, Period Four [Member]        
Line of Credit Facility [Line Items]        
Debt instrument, redemption price, percentage of principal amount redeemed   101.00%    
Debt Instrument, Redemption , Percentage   10.00%    
7.125% Senior Secured Notes [Member]        
Line of Credit Facility [Line Items]        
Debt Instrument, Interest Rate, Stated Percentage 7.125%   7.125%  
Debt related commitment fees and debt issuance costs   $ 1,100,000    
Debt Issuance Costs, Net   4,200,000    
7.125% Senior Secured Notes [Member] | 2024 Notes [member]        
Line of Credit Facility [Line Items]        
Debt related commitment fees and debt issuance costs   3,000,000.0    
7.125% Senior Secured Notes [Member] | 2028 Notes [member] | Operating Expense [Member]        
Line of Credit Facility [Line Items]        
Third party debt modification costs   $ 2,300,000