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REVENUES FROM CONTRACTS WITH CUSTOMERS - Schedule of disaggregated revenue by category (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Disaggregation of Revenue [Line Items]
Revenue	$ 43,880	$ 41,978	$ 87,153	$ 83,694
Revenue concentration risk | Revenue benchmark
Disaggregation of Revenue [Line Items]
Revenue	$ 43,880	41,978	$ 87,153	83,694
Percentage of revenue	100.00%		100.00%
Enterprise, Education and Technology
Disaggregation of Revenue [Line Items]
Revenue	$ 31,158	30,403	$ 62,488	60,130
Enterprise, Education and Technology | Revenue concentration risk | Revenue benchmark
Disaggregation of Revenue [Line Items]
Revenue	$ 31,158	$ 30,403	$ 62,488	$ 60,130
Percentage of revenue	100.00%	100.00%	100.00%	100.00%
Media and Telecom
Disaggregation of Revenue [Line Items]
Revenue	$ 12,722	$ 11,575	$ 24,665	$ 23,564
Media and Telecom | Revenue concentration risk | Revenue benchmark
Disaggregation of Revenue [Line Items]
Revenue	$ 12,722	$ 11,575	$ 24,665	$ 23,564
Percentage of revenue	100.00%	100.00%	100.00%	100.00%
Subscription
Disaggregation of Revenue [Line Items]
Revenue	$ 40,724	$ 37,972	$ 81,116	$ 74,989
Subscription | Enterprise, Education and Technology | Revenue concentration risk | Revenue benchmark
Disaggregation of Revenue [Line Items]
Revenue	$ 30,258	$ 28,280	$ 60,132	$ 55,882
Percentage of revenue	97.10%	93.00%	96.20%	92.90%
Subscription | Media and Telecom | Revenue concentration risk | Revenue benchmark
Disaggregation of Revenue [Line Items]
Revenue	$ 10,466	$ 9,692	$ 20,984	$ 19,107
Percentage of revenue	82.30%	83.70%	85.10%	81.10%
Professional services
Disaggregation of Revenue [Line Items]
Revenue	$ 3,156	$ 4,006	$ 6,037	$ 8,705
Professional services | Enterprise, Education and Technology | Revenue concentration risk | Revenue benchmark
Disaggregation of Revenue [Line Items]
Revenue	$ 900	$ 2,123	$ 2,356	$ 4,248
Percentage of revenue	2.90%	7.00%	3.80%	7.10%
Professional services | Media and Telecom | Revenue concentration risk | Revenue benchmark
Disaggregation of Revenue [Line Items]
Revenue	$ 2,256	$ 1,883	$ 3,681	$ 4,457
Percentage of revenue	17.70%	16.30%	14.90%	18.90%

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