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INTANGIBLE ASSETS - Intangible Assets (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Intangible Assets [Line Items]          
Amortization of Intangible Assets $ 100 $ 100 $ 100 $ 100  
Patents, trademarks and tradename          
Intangible Assets [Line Items]          
Gross carrying value 520   520   $ 520
Accumulated amortization 144   144   116
Net carrying value $ 376   $ 376   $ 404