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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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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Summary of significant accounting policies - Principles of consolidation (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Jan. 01, 2016
Accounting Standards Update 2016-09 [Member] \| 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
Accounting Standards Update 2016-09 [Member] \| Early adoption \| Federal
Basis of presentation
Increase to deferred tax assets		6,933
Accounting Standards Update 2016-09 [Member] \| Early adoption \| State
Basis of presentation
Increase to deferred tax assets		$ 589
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%