Quarterly report pursuant to Section 13 or 15(d)

Long-Term Debt - Summary of Long-term Debt Instruments (Detail)

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Long-Term Debt - Summary of Long-term Debt Instruments (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Debt Instrument [Line Items]    
Beginning balance $ 171,175  
Fair value of financial liabilities issued 11,020  
Accretion of balance 4,852  
Repayment (14) $ (11,212)
Ending balance 187,033  
Secured Notes    
Debt Instrument [Line Items]    
Beginning balance 115,350  
Fair value of financial liabilities issued 10,860  
Accretion of balance 4,007  
Ending balance 130,217  
May 2019 Debentures    
Debt Instrument [Line Items]    
Beginning balance 23,240  
Accretion of balance 193  
Ending balance 23,433  
March 2019 Debentures    
Debt Instrument [Line Items]    
Beginning balance 31,665  
Accretion of balance 357  
Ending balance 32,022  
Other    
Debt Instrument [Line Items]    
Beginning balance 920  
Fair value of financial liabilities issued 160  
Accretion of balance 295  
Repayment (14)  
Ending balance $ 1,361