GOODWILL AND OTHER INTANGIBLES - Amortization Expense of Acquired Intangibles (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Acquired Finite-Lived Intangible Assets [Line Items]
Amortization of intangible assets	$ 1,002	$ 1,017	$ 2,004	$ 2,034
Cost of revenue
Acquired Finite-Lived Intangible Assets [Line Items]
Amortization of intangible assets	629	647	1,258	1,294
Selling and marketing
Acquired Finite-Lived Intangible Assets [Line Items]
Amortization of intangible assets	$ 373	$ 370	$ 746	$ 740