Fair Value Measurement - Schedule of Financial Assets and Liabilities (Details) - USD ($)	Jun. 30, 2018	Jun. 30, 2017
Financial Assets:
Marketable securities	$ 0	$ 3,023,000
Fair Value, Measurements, Recurring
Financial Assets:
Marketable securities		3,023,000
Derivative financial instrument asset (note 16)	0	1,174,000
Financial Assets	0	4,197,000
Financial Liabilities:
Derivative financial instrument liability (note 16)	(1,319,000)	0
Financial Liabilities	(1,319,000)	0
Fair Value, Measurements, Recurring | Significant other observable inputs (Level 2)
Financial Assets:
Marketable securities		3,023,000
Derivative financial instrument asset (note 16)	0	1,174,000
Financial Assets	0	4,197,000
Financial Liabilities:
Derivative financial instrument liability (note 16)	(1,319,000)	0
Financial Liabilities	$ (1,319,000)	$ 0