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Convertible Notes, Net - Summary of Details about Interest Expense (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Debt Instrument [Line Items]        
Discount and issuance cost amortization     $ 19,277 $ 18,699
Convertible Senior Note [Member]        
Debt Instrument [Line Items]        
Cash coupon $ 7,015 $ 7,015 14,030 14,030
Discount and issuance cost amortization 869 828 1,722 1,639
Total interest expense $ 7,884 $ 7,843 $ 15,752 $ 15,669