Debt - Interest Expense Related to 0.875% Convertible Senior Notes (Detail) - 0.875% Convertible Senior Notes [Member] - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Debt Instrument [Line Items]
Coupon interest	$ 455	$ 455	$ 910	$ 910
Amortization of discounts and debt issuance costs	228	1,474	456	2,933
Total interest expense related to the 0.875% Convertible Senior Notes	$ 683	$ 1,929	$ 1,366	$ 3,843

Amount of amortization expense attributable to debt discount (premium) and debt issuance costs.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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Balance Type:	debit
Period Type:	duration