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Fair Value Measurements - Assets and Liabilities Carried at Fair Value Measured on Recurring Basis (Detail) - USD ($)	Dec. 31, 2018	Jun. 30, 2018	Jun. 30, 2017
Fair Value, Measurements, Recurring [Member]
Assets:
Cash equivalents	$ 43,194,000	$ 28,826,000	$ 13,521,000
Total cash equivalents	43,194,000	28,826,000	13,521,000
Liabilities:
Derivative liabilities		19,780,000
Total derivative liabilities		19,780,000
Quoted Prices in Active Markets (Level 1) [Member] | Fair Value, Measurements, Recurring [Member]
Assets:
Cash equivalents	43,194,000	28,826,000	13,521,000
Total cash equivalents	43,194,000	28,826,000	13,521,000
Liabilities:
Derivative liabilities		0
Total derivative liabilities		0
Significant Other Observable Inputs (Level 2) [Member] | Fair Value, Measurements, Recurring [Member]
Assets:
Cash equivalents	0	0	0
Total cash equivalents	0	0	0
Liabilities:
Derivative liabilities		0
Total derivative liabilities		0
Significant Unobservable Inputs (Level 3) [Member]
Liabilities:
Derivative liabilities	0	19,780,000	0
Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Recurring [Member]
Assets:
Cash equivalents	0	0	0
Total cash equivalents	$ 0	0	$ 0
Liabilities:
Derivative liabilities		19,780,000
Total derivative liabilities		$ 19,780,000

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Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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Amount of short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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Fair value of financial and nonfinancial obligations.

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