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LEASES - Narrative (Details)
$ in Thousands
9 Months Ended
Sep. 30, 2019
USD ($)
Lessee, Lease, Description [Line Items]  
Discount rate 4.00%
Net, non cash lease expense $ 2
Reduction of operating right-of-use assets 78
Reduction of operating lease liabilities 90
Unrealized gain on foreign currency remeasurement $ 14
Sophia, Bulgaria  
Lessee, Lease, Description [Line Items]  
Term of contract 2 years