Sale of IPv4 addresses (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2015	Mar. 31, 2014	Jun. 30, 2014
Finite-Lived Intangible Assets [Line Items]
Book value of Intangible assets	$ 367		$ 367		$ 476
Gain on sale of IPv4 addresses, net	0	0	339	0
IPv4 Addresses [Member]
Finite-Lived Intangible Assets [Line Items]
Book value of Intangible assets	$ 0		$ 0