SEGMENT AND GEOGRAPHIC INFORMATION - Segment Results of Operations (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Revenue
Revenue	$ 635,764	$ 523,756	$ 415,287
Segment gross profit
Total segment gross profit	394,386	387,767	291,434
Platform and support costs	42,134	37,471	28,014
Stock-based compensation expense	2,593	3,089	2,092
Segment amortization		2,638	2,244
Total reconciling items	64,615	56,288	41,965
Gross profit	329,771	331,479	249,469
Amortization of internal-use software
Segment gross profit
Segment amortization	16,894	13,128	9,675
Amortization of intangible assets
Segment gross profit
Segment amortization	2,994	2,600	2,184
Consumer
Revenue
Revenue	365,221	295,583	246,187
Segment gross profit
Total segment gross profit	193,001	214,305	161,510
Enterprise
Revenue
Revenue	219,542	181,284	120,429
Segment gross profit
Total segment gross profit	150,384	126,573	81,253
Degrees
Revenue
Revenue	51,001	46,889	48,671
Segment gross profit
Total segment gross profit	$ 51,001	$ 46,889	$ 48,671