Sale of IPv4 addresses (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Sep. 30, 2014	Sep. 30, 2013	Jun. 30, 2014
Finite-Lived Intangible Assets [Line Items]
Book value of Intangible assets	$ 442		$ 476
Gain on sale of IPv4 addresses, net	339	0
IPv4 addresses [Member]
Finite-Lived Intangible Assets [Line Items]
Book value of Intangible assets	0
Gain on sale of IPv4 addresses, net	$ 339

Amount of gain (loss) on sale or disposal of intangible assets.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.7,9)

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration