SEGMENT REPORTING - Reconciliation of Adjusted Income (Loss) From Before Interest, Taxes, Depreciation And Amortization (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Segment Reporting [Abstract]
Net income	$ 8,113	$ 4,144
Deferred revenue and other acquisition-related adjustments	79	0
Depreciation	578	553
Amortization of software development costs	526	73
Amortization of acquisition-related intangibles	3,672	3,057
Stock-based compensation	1,717	1,034
Severance and other non-recurring charges	594	2,193
Interest expense and other, net	761	(187)
Gain on contingent consideration	(1,250)	0
Provision for income taxes	1,363	957
Total adjusted EBITDA	$ 16,153	$ 11,824