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Long-term Debt - Net Carrying Amount of Liability Component of Convertible Debt (Detail) - USD ($) $ in Thousands	Dec. 31, 2020	Apr. 30, 2020	Dec. 31, 2019	Jun. 30, 2016
2021 Notes and Convertible Notes [Member]
Debt Instrument [Line Items]
Unamortized issuance cost		$ (4,500)		$ (5,000)
2021 Notes and Convertible Notes [Member] \| Debt, Liability Component [Member]
Debt Instrument [Line Items]
Principal	$ 172,500		$ 172,500
Unamortized discount	(3,182)		(10,462)
Unamortized issuance cost	(542)		(1,738)
Net carrying amount	168,776		$ 160,300
2025 Notes and Convertible Notes [Member] \| Debt, Liability Component [Member]
Debt Instrument [Line Items]
Principal	189,750
Unamortized discount	(43,919)
Unamortized issuance cost	(4,060)
Net carrying amount	$ 141,771