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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Fair Value (Details)
$ in Thousands
Jun. 30, 2020
USD ($)
Dec. 31, 2019
USD ($)
Assets:    
Outstanding borrowings $ 80,900 $ 86,900
Fair value of outstanding borrowing $ 79,900 $ 86,700
Discount rate | Minimum    
Assets:    
Debt instrument, measurement input 0.0241 0.0241
Discount rate | Maximum    
Assets:    
Debt instrument, measurement input 0.0255 0.0255
Recurring    
Assets:    
Cash equivalents $ 17 $ 17
Total 17 17
Recurring | Level1    
Assets:    
Cash equivalents 17 17
Total $ 17 $ 17