v3.6.0.2

Summary of significant accounting policies - Basis of presentation and consolidation (Details) - USD ($) $ in Thousands |  | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Aug. 04, 2015 | Dec. 31, 2015 | Dec. 31, 2016 | Jan. 01, 2016 | Aug. 03, 2015
Principles of consolidation |  |  |  |  |
Reduction to additional paid-in capital resulting from purchase of remaining noncontrolling interest |  | $ 1,150 |  |  |
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% |  |  |  |
Total purchase price | $ 1,150 |  |  |  |
Reduction to additional paid-in capital resulting from purchase of remaining noncontrolling interest | $ 1,150 |  |  |  |
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%

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