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
6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Debt Instrument [Line Items]    
Beginning balance $ 171,175  
Fair value of financial liabilities issued 11,730  
Accretion of balance 7,516  
Repayment (28) $ (11,228)
Ending balance 190,393  
Secured Notes    
Debt Instrument [Line Items]    
Beginning balance 115,350  
Fair value of financial liabilities issued 11,570  
Accretion of balance 6,109  
Ending balance 133,029  
May 2019 Debentures    
Debt Instrument [Line Items]    
Beginning balance 23,240  
Accretion of balance 390  
Ending balance 23,630  
March 2019 Debentures    
Debt Instrument [Line Items]    
Beginning balance 31,665  
Accretion of balance 722  
Ending balance 32,387  
Other    
Debt Instrument [Line Items]    
Beginning balance 920  
Fair value of financial liabilities issued 160  
Accretion of balance 295  
Repayment (28)  
Ending balance $ 1,347