LEASES - Narrative (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2021 USD ($) tranche	Sep. 30, 2020 USD ($)	Dec. 31, 2020 USD ($)
Lessee, Lease, Description [Line Items]
Number of tranches | tranche			4
Finance lease liability	$ 2,510		$ 2,510		$ 2,631
Rent expense charged to operations under lease agreements	$ 788	$ 702	$ 2,274	$ 2,179
Years 1 and 2
Lessee, Lease, Description [Line Items]
Discount rate	1.45%		1.45%
Years 1 and 2 | Minimum
Lessee, Lease, Description [Line Items]
Term of contract for operating leases	1 year		1 year
Years 1 and 2 | Maximum
Lessee, Lease, Description [Line Items]
Term of contract for operating leases	2 years		2 years
Years 3 and 4
Lessee, Lease, Description [Line Items]
Discount rate	2.04%		2.04%
Years 3 and 4 | Minimum
Lessee, Lease, Description [Line Items]
Term of contract for operating leases	3 years		3 years
Years 3 and 4 | Maximum
Lessee, Lease, Description [Line Items]
Term of contract for operating leases	4 years		4 years
Years 5 and 9
Lessee, Lease, Description [Line Items]
Discount rate	2.38%		2.38%
Years 5 and 9 | Minimum
Lessee, Lease, Description [Line Items]
Term of contract for operating leases	5 years		5 years
Years 5 and 9 | Maximum
Lessee, Lease, Description [Line Items]
Term of contract for operating leases	9 years		9 years
Years more than 10
Lessee, Lease, Description [Line Items]
Term of contract for operating leases	10 years		10 years
Discount rate	3.10%		3.10%