Stockholders' Equity - Market-Based Restricted Stock Units - Additional Information (Detail) - Market-based RSUs [Member] - shares	9 Months Ended	12 Months Ended
Mar. 31, 2018	Jun. 30, 2017
Class of Stock [Line Items]
Restricted stock units issued		700,000
Forfeiture restricted stock units	200,000
2008 Incentive Plan [Member]
Class of Stock [Line Items]
Restricted stock units issued		200,000
President and CEO [Member] \| Inducement Award [Member]
Class of Stock [Line Items]
Restricted stock units issued		500,000

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

No definition available.

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- Definition

The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(iv)(3)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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- Definition

The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(iii)(1)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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