Debt - Interest Expense (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Total interest expense	$ 13,166	$ 34,104	$ 43,172
Convertible Senior Notes and Senior Secured Credit Facility [Member]
Debt Instrument [Line Items]
Interest expense	5,691	18,113	26,648
Amortization of discounts and debt issuance costs	7,475	15,991	16,524
Total interest expense	$ 13,166	$ 34,104	$ 43,172