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Long-Term Debt - Summary of Long-Term Debt (Detail) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Debt Instrument [Line Items]    
Total principal amount $ 162,333 $ 173,695
Finance lease liabilities 48 60
Less: unamortized discount and issuance costs (6,658) (10,000)
Total long-term debt 155,675 163,695
4.25% Convertible Senior Notes [Member]    
Debt Instrument [Line Items]    
Total principal amount 139,200 143,750
3.95% Promissory Note [Member]    
Debt Instrument [Line Items]    
Total principal amount   8,881
4% Promissory Note [Member]    
Debt Instrument [Line Items]    
Total principal amount   7,345
3.75% Callable Promissory Note [Member]    
Debt Instrument [Line Items]    
Total principal amount 7,695 7,955
4.55% Promissory note [Member]    
Debt Instrument [Line Items]    
Total principal amount 5,529 $ 5,704
3.90% Promissory Note [Member]    
Debt Instrument [Line Items]    
Total principal amount $ 9,861