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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Fair Value of Financial Instruments (Details)
 12 Months Ended
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2018
USD ($)
Fair Value of Financial Instruments      
Transfers of financial assets between Level 1 and Level 2 $ 0    
Transfers of financial assets between Level 2 and Level 1 0    
Transfers of financial assets into Level 3 0    
Transfers of financial assets out of Level 3 0    
Liabilities:      
Contingent consideration 1,703,000 $ 1,703,000 $ 1,703,000
Change in the contingent consideration liability      
Beginning Balance 1,703,000 3,698,000  
Payment of contingent consideration (1,730,000) (2,401,000)  
Change in value of contingent consideration   356,000  
Accretion of contingent consideration 30,000 52,000  
Unrealized (loss) gain related to currency translation (3,000) (2,000)  
Ending Balance   1,703,000  
Outstanding borrowings 86,863,000   99,113,000
Fair value of outstanding borrowing $ 86,700,000   98,900,000
Debt instrument, valuation technique, extensible list us-gaap:ValuationTechniqueDiscountedCashFlowMember    
Debt instrument, measurement input, extensible list us-gaap:MeasurementInputDiscountRateMember    
Minimum      
Liabilities:      
Contingent consideration, measurement input 0.145    
Change in the contingent consideration liability      
Debt instrument, measurement input 0.050    
Maximum      
Liabilities:      
Contingent consideration, measurement input 0.285    
Change in the contingent consideration liability      
Debt instrument, measurement input 0.052    
Level3      
Liabilities:      
Contingent consideration, valuation technique extensible list us-gaap:IncomeApproachValuationTechniqueMember    
Contingent consideration, measurement input Contingent consideration, measurement input us-gaap:MeasurementInputDiscountRateMember    
Recurring      
Assets:      
Cash equivalents $ 17,000   315,000
Total 17,000   315,000
Liabilities:      
Contingent consideration 1,703,000 1,703,000 1,703,000
Total     1,703,000
Change in the contingent consideration liability      
Beginning Balance 1,703,000    
Ending Balance   1,703,000  
Recurring | Level1      
Assets:      
Cash equivalents 17,000   315,000
Total 17,000   315,000
Recurring | Level3      
Liabilities:      
Contingent consideration 1,703,000 1,703,000 1,703,000
Total     $ 1,703,000
Change in the contingent consideration liability      
Beginning Balance $ 1,703,000    
Ending Balance   $ 1,703,000