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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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e681-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=36458714&loc=SL7669646-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e637-108580 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6915805&loc=d3e32022-110900 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=36458714&loc=SL7669686-108580 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450520&loc=d3e32583-110901 + Details
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- Definition The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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