Commitments and Contingencies - Rental Expense (Details) - USD ($) $ in Millions	3 Months Ended
Sep. 30, 2017	Sep. 30, 2016
Operating Leases
Rent expense	$ 2.0	$ 2.2
Minimum
Operating Leases
Operating lease terms	1 year

Term of lessee's operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (a)(3)
-URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918673-209980

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Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration