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LEASES - Summary of Operating Lease Cost and Supplemental Cash Flow Information Related to Operating Leases (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2019
Jun. 30, 2019
Dec. 31, 2018
Leases [Abstract]      
Operating lease cost $ 430 $ 860 $ 1,700
Non-cash activity:      
Right-of-use assets obtained in exchange for lease obligations   $ 8,273