SEGMENTS - Adjusted Contribution Reconciliation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Segment Reporting [Abstract]
Adjusted contribution	$ 143,035	$ 129,628	$ 82,182
Deferred implementation costs	0	3,785	4,598
Delivery costs	30,403	22,503	14,310
Sales and marketing expense	74,745	65,996	45,307
Research and development expense	54,435	38,104	17,532
General and administration expense	81,446	66,222	46,532
Depreciation and amortization expense	37,544	29,871	7,826
Total non-operating (income) expense	8,932	13,830	1,499
Acquisition and integration costs (benefits)	(2,874)	24,372	0
Loss before income taxes	(466,710)	(136,429)	(55,422)
Income tax benefit	(1,446)	(7,864)	0
Change in fair value of contingent consideration	(128,174)	1,374	0
Impairment of goodwill and intangible assets	$ 453,288	$ 0	$ 0