DEBT - Summary of Interest Expense on Debt (Detail) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Schedule Of Interest Expenses [Line Items]
Total interest expense on convertible debt	$ 15,337	$ 29,309	$ 23,460
Convertible Senior Notes
Schedule Of Interest Expenses [Line Items]
Coupon interest expense	10,465	12,350	4,907
Accretion of discount on convertible notes	3,339	14,682	15,917
Amortization of debt issuance costs	593	1,829	2,031
Total interest expense on convertible debt	$ 14,397	$ 28,861	$ 22,855

Amount of the cost of borrowed funds accounted for as interest expense.

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Name:	us-gaap_InterestExpense
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration