Fair Value Measurement - Schedule of Financial Assets and Liabilities (Details) - USD ($)	Dec. 31, 2017	Jun. 30, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	$ 0	$ 3,023,000
Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities		3,023,000
Derivative financial instrument asset	1,078,000	1,174,000
Financial Assets	1,078,000	4,197,000
Fair Value, Measurements, Recurring | Significant other observable inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities		3,023,000
Derivative financial instrument asset	1,078,000	1,174,000
Financial Assets	$ 1,078,000	$ 4,197,000