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CONTRACTS WITH CUSTOMERS AND REVENUE CONCENTRATION - Narrative (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]    
Allowance for doubtful accounts $ 771 $ 904
Net receivables from contracts with customers 4,852 4,808
Deferred commissions costs 3,792 2,697
Amortization of deferred sales commissions 906 $ 1,398
Deferred revenue 3,783  
Revenue expected from remaining performance obligations $ 31,503  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-01-01    
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]    
Percentage of revenue expected from remaining performance obligation, Percentage 71.00%  
Expected timing for remaining performance obligation (in months) 12 months