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LEASES - NARRATIVE (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Jan. 01, 2019
Dec. 31, 2018
Leases [Abstract]      
Operating lease liabilities $ 4,377 $ 4,850  
Operating lease, borrowing rate   3.25%  
Right-of-use assets $ 3,628 $ 4,048 $ 0
Deferred rent     $ 764