LEASES - Narrative (Details) ft² in Thousands, $ in Thousands			1 Months Ended
	Jul. 06, 2021 USD ($) ft²	Mar. 31, 2021 USD ($)	Feb. 28, 2021 USD ($)	Sep. 30, 2021 USD ($)	Aug. 01, 2021 USD ($)	Dec. 31, 2020 USD ($)
Lessee, Lease, Description [Line Items]
Gain lease termination			$ 18,000
Decrease in lease liabilities			$ 21,100
Base rent to paid, year one				$ 9,948
Lease liabilities				97,756
Right-of-use assets				$ 91,349		$ 67,651
Building
Lessee, Lease, Description [Line Items]
Term of contract	11 years	4 years 6 months
Based rent to paid (annually per year)		$ 2,000
Area of office space lease (in square feet) | ft²	131
Base rent to paid, year one	$ 6,000
Base rent increase percentage	0.03
Improvement allowance	$ 11,800
Lease liabilities					$ 42,100
Right-of-use assets					$ 42,100