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Debt - Schedule of Net Carrying Value of Liability Component of Convertible Notes (Detail) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Principal	$ 230,000	$ 260,000
Less: unamortized debt discount	29,616	37,190
Less: unamortized debt issuance costs	3,588	4,548
Convertible Senior Notes Due in 2024 [Member]
Debt Instrument [Line Items]
Principal	230,000	230,000
Less: unamortized debt discount	29,616	37,190
Less: unamortized debt issuance costs	3,588	4,510
Net carrying amount	$ 196,796	$ 188,300

Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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