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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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