INCOME TAXES - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Income Tax Disclosure [Abstract]
Net operating loss carryforwards	$ 37,132	$ 38,737
Deferred revenue	2,875	3,914
Accounts payable and accrued expenses	16,361	14,067
Stock-based compensation	1,735	1,887
Operating lease liabilities	2,815	3,071
Tax credit carryforwards	404	423
Other	128	193
Foreign deferred assets	1,759	2,055
Business interest carryforwards	15,504	15,598
Gross deferred income tax assets	78,713	79,945
Valuation allowance for deferred income tax assets	(399)	(66,100)
Net deferred income tax assets	78,314	13,845
Deferred income tax liabilities:
Deferred contract costs	(8,890)	(8,208)
Operating lease right-of-use assets	(1,866)	(2,573)
Other	(3,525)	(1,193)
Deferred tax assets, net	$ 64,033	$ 1,871