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Fair Value Measurement - Schedule of Financial Assets and Liabilities (Details) - Fair Value, Measurements, Recurring - USD ($)
$ in Thousands
Sep. 30, 2019
Jun. 30, 2019
Financial Assets:    
Foreign currency forward contracts designated as cash flow hedges (note 17) $ 0 $ 736
Financial Liabilities:    
Foreign currency forward contracts designated as cash flow hedges (note 17) (31) 0
Significant other observable inputs (Level 2)    
Financial Assets:    
Foreign currency forward contracts designated as cash flow hedges (note 17) 0 736
Financial Liabilities:    
Foreign currency forward contracts designated as cash flow hedges (note 17) $ (31) $ 0