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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Fair Value (Details)
$ in Thousands
 9 Months Ended
Sep. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
Sep. 30, 2020
USD ($)
Dec. 31, 2019
USD ($)
Liabilities:        
Contingent consideration $ 4,948 $ 1,703 $ 4,948  
Business Combination, Contingent Consideration, Liability, Valuation Technique [Extensible List]     us-gaap:IncomeApproachValuationTechniqueMember  
Business Combination, Contingent Consideration, Liability, Measurement Input [Extensible List]     us-gaap:MeasurementInputDiscountRateMember  
Contingent consideration, measurement input     0.0250  
Change in the contingent consideration liability        
Beginning Balance   1,703    
Neuralify contingent consideration accrued 4,900      
Payment of contingent consideration   (1,730)    
Accretion of contingent consideration 48 30    
Unrealized gain (loss) related to currency translation   $ (3)    
Ending Balance 4,948      
Debt instrument, valuation technique, extensible list     us-gaap:ValuationTechniqueDiscountedCashFlowMember  
Debt instrument, measurement input, extensible list     us-gaap:MeasurementInputDiscountRateMember  
Debt instrument, measurement input     0.0248  
Outstanding borrowings     $ 79,900 $ 86,900
Fair value of outstanding borrowing     78,800 86,700
Recurring        
Assets:        
Cash equivalents     17 17
Total     17 17
Liabilities:        
Contingent consideration 4,948   4,948  
Total     4,948  
Change in the contingent consideration liability        
Ending Balance 4,948      
Recurring | Level1        
Assets:        
Cash equivalents     17 17
Total     17 $ 17
Recurring | Level3        
Liabilities:        
Contingent consideration 4,948   4,948  
Total     $ 4,948  
Change in the contingent consideration liability        
Ending Balance $ 4,948