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Fair Value Measurement - Schedule of Financial Assets and Liabilities (Details) - Fair Value, Measurements, Recurring - USD ($)
$ in Thousands
Dec. 31, 2018
Jun. 30, 2018
Financial Liabilities:    
Derivative financial instrument liability (note 16) $ (2,056) $ (1,319)
Financial Liabilities (2,056) (1,319)
Significant other observable inputs (Level 2)    
Financial Liabilities:    
Derivative financial instrument liability (note 16) (2,056) (1,319)
Financial Liabilities $ (2,056) $ (1,319)