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Debt - Summary of Interest Expense on Convertible Debt (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Schedule Of Interest Expenses [Line Items]
Total interest expense on convertible debt	$ 3,817	$ 8,048	$ 7,621	$ 14,963
Convertible Senior Notes
Schedule Of Interest Expenses [Line Items]
Coupon interest expense	2,616	3,016	5,232	5,188
Accretion of discount on convertible notes	834	4,395	1,668	8,505
Amortization of debt issuance costs	148	522	296	1,030
Total interest expense on convertible debt	$ 3,598	$ 7,933	$ 7,196	$ 14,723

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Amount of noncash expense included in interest expense to amortize debt discount and premium associated with the related debt instruments. Excludes amortization of financing costs. Alternate captions include noncash interest expense.

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