Summary of significant accounting policies (Details 3) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
Sep. 30, 2015	Dec. 31, 2014
Foreign Currency Translation
Cumulative foreign currency translation adjustments, net of tax in accumulated other comprehensive income	$ 1,230	$ 443
Income tax expense related to foreign currency translation adjustments	0	0
Revolving Line of Credit \| Prepaid expenses and other current assets
Recent accounting pronouncements
Debt issuance costs	197	178
Revolving Line of Credit \| Other assets
Recent accounting pronouncements
Debt issuance costs	$ 421	$ 514
DAS \| Minimum
Revenue recognition
Term of the arrangement used to determine revenue recognition	5 years
DAS \| Maximum
Revenue recognition
Term of the arrangement used to determine revenue recognition	20 years
Wholesale - Wi-Fi \| Minimum
Revenue recognition
Term of the arrangement used to determine revenue recognition	1 year
Wholesale - Wi-Fi \| Maximum
Revenue recognition
Term of the arrangement used to determine revenue recognition	5 years

Accumulated adjustment, net of tax, that results from the process of translating subsidiary financial statements and foreign equity investments into the reporting currency from the functional currency of the reporting entity, net of reclassification of realized foreign currency translation gains or losses.

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