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

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards.

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Amount of cumulative effect of the change in accounting principle or new accounting pronouncement on retained earnings or other components of equity or net assets in the statement of financial position as of the beginning of the earliest period presented.

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Summary of significant accounting policies - General (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Jan. 01, 2016	Aug. 04, 2015	Aug. 03, 2015
ASU 2016-09 \| Early adoption
Basis of presentation
Increase to additional paid-in capital and accumulated deficit due to cumulative effect of a change in accounting principle		$ 94
ASU 2016-09 \| Early adoption \| Federal
Basis of presentation
Increase to deferred tax assets		6,933
ASU 2016-09 \| Early adoption \| State
Basis of presentation
Increase to deferred tax assets		$ 589
Concourse Communications Detroit, LLC
Principles of consolidation
Percentage of additional ownership in Subsidiary acquired			30.00%
Chicago Concourse Development Group, LLC
Principles of consolidation
Percentage of ownership in subsidiaries	70.00%
Boingo Holding Participacoes Ltda.
Principles of consolidation
Percentage of ownership in subsidiaries	75.00%
Concourse Communications Detroit, LLC
Principles of consolidation
Percentage of ownership in subsidiaries				70.00%