Convertible Senior Notes - Schedule of Net Carrying Amount of Liability Component (Detail) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Net carrying amount	$ 383,101	$ 471,099
0.375%Convertible Senior Notes Due 2025 as Liability Component [Member]
Debt Instrument [Line Items]
Principal	459,999	460,000
Unamortized debt discount	(70,594)	(88,756)
Unamortized issuance costs	(5,544)	(6,973)
Net carrying amount	383,861	364,271
0.25% Convertible Senior Notes Due 2022 as Liability Component [Member]
Debt Instrument [Line Items]
Principal	19,382	125,839
Unamortized debt discount	(477)	(10,397)
Unamortized issuance costs	(35)	(777)
Net carrying amount	$ 18,870	$ 114,665

Carrying value as of the balance sheet date of long-term debt (with maturities initially due after one year or beyond the operating cycle if longer) identified as Convertible Notes Payable, excluding current portion. Convertible Notes Payable is a written promise to pay a note which can be exchanged for a specified amount of another, related security, at the option of the issuer and the holder.

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The remaining balance of debt issuance expenses that were capitalized and are being amortized against income over the lives of the respective bond issues. This does not include the amounts capitalized as part of the cost of the utility plant or asset.

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