Debt - Interest Expense Related to 0.875% Convertible Senior Notes (Detail) - 0.875% Convertible Senior Notes [Member] - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2022	Mar. 31, 2021
Debt Instrument [Line Items]
Coupon interest	$ 455	$ 455
Amortization of discounts and debt issuance costs	228	1,459
Total interest expense related to the convertible notes	$ 683	$ 1,914

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 2: http://www.xbrl.org/2003/role/exampleRef
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration