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Long-term Debt - Schedule of Interest Expense Related to Notes (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2021
Jun. 30, 2020
Debt Instrument [Line Items]      
Amortization of Issuance Costs   $ 2,977 $ 0
Convertible Debt      
Debt Instrument [Line Items]      
Contractual Interest Expense $ 1,219 2,438  
Amortization of Issuance Costs 1,740 2,912  
Total interest expense 2,959 5,350  
Convertible Senior Notes due 2025 | Convertible Debt      
Debt Instrument [Line Items]      
Contractual Interest Expense 1,219 2,438  
Amortization of Issuance Costs 741 1,480  
Total interest expense 1,960 3,918  
Convertible Senior Notes due 2027 | Convertible Debt      
Debt Instrument [Line Items]      
Contractual Interest Expense 0 0  
Amortization of Issuance Costs 999 1,432  
Total interest expense 999 1,432  
Secured Notes Due Twenty Twenty Eight      
Debt Instrument [Line Items]      
Contractual Interest Expense 1,361 1,361  
Amortization of Issuance Costs 65 65  
Total interest expense $ 1,426 $ 1,426