REVENUE FROM CONTRACTS WITH CUSTOMERS - Narrative (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021 USD ($)	Jun. 30, 2020 USD ($)	Jun. 30, 2021 USD ($) segment	Jun. 30, 2020 USD ($)	Dec. 31, 2020 USD ($)
Disaggregation of Revenue [Line Items]
Number of reportable segments | segment			2
Net revenues	$ 75,248	$ 61,562	$ 157,880	$ 126,305
Unbilled receivables, current	13,700		13,700		$ 16,000
Contract with customer, liability, revenue recognized			5,000	5,500
Revenue, remaining performance obligation, amount	8,600		8,600
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-07-01
Disaggregation of Revenue [Line Items]
Revenue, remaining performance obligation, amount	$ 4,700		$ 4,700
Revenue, remaining performance obligation, expected timing of satisfaction, period	12 months		12 months
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-01-01
Disaggregation of Revenue [Line Items]
Revenue, remaining performance obligation, amount	$ 2,300		$ 2,300
Revenue, remaining performance obligation, expected timing of satisfaction, period	1 year		1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-01-01 | Performance Period Two Through Four
Disaggregation of Revenue [Line Items]
Revenue, remaining performance obligation, amount	$ 3,900		$ 3,900
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-01-01
Disaggregation of Revenue [Line Items]
Revenue, remaining performance obligation, amount	$ 1,400		$ 1,400
Revenue, remaining performance obligation, expected timing of satisfaction, period	1 year		1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-01-01
Disaggregation of Revenue [Line Items]
Revenue, remaining performance obligation, amount	$ 200		$ 200
Revenue, remaining performance obligation, expected timing of satisfaction, period	1 year		1 year
Data Analytics
Disaggregation of Revenue [Line Items]
Net revenues	$ 3,597	2,942	$ 6,365	4,920
Data Analytics | Transferred at Point in Time
Disaggregation of Revenue [Line Items]
Net revenues	$ 1,700	$ 1,200	$ 3,100	$ 1,800