v3.3.1.900

Summary of significant accounting policies (Details 4) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2015 USD ($) item $ / shares shares	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)
Foreign Currency Translation
Cumulative foreign currency translation adjustments, net of tax in accumulated other comprehensive income	$ (1,160)	$ (443)
Income tax expense related to foreign currency translation adjustments	0	0
Advertising, marketing and promotion costs
Capitalized advertising production costs	0	0	$ 0
Advertising expenses	$ 1,703	$ 1,350	$ 2,302
Assumptions that were used to calculate the grant date fair value of employee stock option grants
Number of stock options granted | shares	0
Dividends declared on common stock (in dollars per share) | $ / shares	$ 0
Dividends paid on common stock (in dollars per share) | $ / shares	$ 0.00
Number of dividend payouts anticipated in the foreseeable future | item	0
Stock options
Assumptions that were used to calculate the grant date fair value of employee stock option grants
Expected term		6 years 3 months	6 years 3 months
Expected volatility (as a percent)		48.60%	49.31%
Risk-free interest rate (as a percent)		1.80%	1.34%
Dividend yield (as a percent)		0.00%	0.00%
DAS license agreements | Minimum
Revenue recognition
Term of the arrangement used to determine revenue recognition	5 years
DAS license agreements | 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

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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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