v3.6.0.2

Summary of significant accounting policies - Non controlling interests (Details) - USD ($) $ in Thousands		12 Months Ended
	Aug. 04, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Aug. 03, 2015	Dec. 31, 2009
Non-controlling interests
Distributions to non-controlling interest holders		$ 286	$ 500	$ 623
Reduction to additional paid-in capital resulting from purchase of remaining noncontrolling interest			1,150
Non-controlling owners capital account amount		$ 738	755
Concourse Communications Detroit, LLC
Non-controlling interests
Percentage of additional ownership in subsidiary acquired	30.00%
Total purchase price	$ 1,150
Reduction to additional paid-in capital resulting from purchase of remaining noncontrolling interest	$ 1,150
Concourse Communications Detroit, LLC
Non-controlling interests
Initial term of Detroit Operating Agreement		7 years
Optional extension period of Detroit Operating Agreement		4 years
Non-controlling owners capital account amount						$ 0
Chicago Concourse Development Group, LLC
Non-controlling interests
Percentage of net profits less capital expenditures of the preceding year allocated to non-controlling interest holders		30.00%
Distributions to non-controlling interest holders		$ 286	500	623
Percentage of ownership in subsidiaries		70.00%
Boingo Holding Participacoes Ltda.
Non-controlling interests
Distributions to non-controlling interest holders		$ 0	$ 0	$ 0
Percentage of ownership in subsidiaries		75.00%
Concourse Communications Detroit, LLC
Non-controlling interests
Percentage of ownership in subsidiaries					70.00%

X

- Definition

Percentage of voting equity interests acquired at the acquisition date in the business combination.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=65885119&loc=d3e1392-128463

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Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 30
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6578-128477

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Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which is directly or indirectly attributable to that ownership interest in subsidiary equity which is not attributable to the parent (that is, noncontrolling interest, previously referred to as minority interest).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(22))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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The equity interest of noncontrolling shareholders, partners or other equity holders in consolidated entity.

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The parent entity's interest in net assets of the subsidiary, expressed as a percentage.

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Amount of cash outflow to a noncontrolling interest. Includes, but not limited to, reduction of noncontrolling interest ownership. Excludes dividends paid to the noncontrolling interest.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Amount of decrease (increase) in additional paid in capital (APIC) for the acquisition of the remaining interest in non-controlling interest.

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