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REVENUE - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Disaggregation of Revenue [Line Items]          
Revenue recognized $ 6,200 $ 5,000 $ 14,700 $ 11,700  
Unsatisfied performance obligations 41,300   41,300   $ 37,600
Flexible spending account commitment 3,000   3,000   $ 4,700
Amortization of capitalized sales commissions $ 600 300 $ 1,500 1,200  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-10-01          
Disaggregation of Revenue [Line Items]          
Remaining performance obligation, expected timing of satisfaction, excluding flexible spending account 12 months   12 months    
Unsatisfied performance obligations, excluding flexible spending account commitment $ 23,400   $ 23,400    
Sales-Based Royalties          
Disaggregation of Revenue [Line Items]          
Revenue recognized $ 739 $ 832 $ 1,913 $ 2,679