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Convertible Senior Notes - Schedule of Net Carrying Amount of Equity Component (Detail) - Convertible Senior Notes
$ in Thousands
Dec. 31, 2020
USD ($)
Debt Instrument [Line Items]  
Debt discount for conversion option $ 153,527
Issuance costs allocated to equity (3,602)
Deferred tax liability, net of deferred tax asset, related to debt discount and issuance costs (42,115)
Net carrying amount of equity $ 107,810