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Debt - Summary of Interest Expense on Convertible Debt (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Schedule Of Interest Expenses [Line Items]
Total interest expense on convertible debt	$ 3,870	$ 9,597	$ 11,491	$ 24,560
Convertible Senior Notes
Schedule Of Interest Expenses [Line Items]
Coupon interest expense	2,617	4,255	7,849	9,443
Accretion of discount on convertible notes	835	4,696	2,503	13,201
Amortization of debt issuance costs	148	535	445	1,565
Total interest expense on convertible debt	$ 3,600	$ 9,486	$ 10,797	$ 24,209

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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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