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FINANCIAL INSTRUMENTS - Significant Unobservable Inputs (Details) - Level 3 - Derivative financial instruments. - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2019
Financial instruments    
Derivative liabilities- Balance at beginning of the period $ 1,317 $ 344
Fair value adjustments recognized in profit or loss (1,304) (331)
Derivative liabilities- balance at end of the period $ 13 $ 13