GOODWILL AND OTHER INTANGIBLE ASSETS - Amortization Expense of Acquired Intangibles (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Acquired Finite-Lived Intangible Assets [Line Items]
Amortization of intangible assets	$ 3,987	$ 3,970	$ 6,625
Cost of revenue
Acquired Finite-Lived Intangible Assets [Line Items]
Amortization of intangible assets	2,516	2,487	3,500
Selling and marketing
Acquired Finite-Lived Intangible Assets [Line Items]
Amortization of intangible assets	$ 1,471	$ 1,483	$ 3,125