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Stock repurchases (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
12 Months Ended 0 Months Ended
Dec. 31, 2013
Apr. 01, 2013
Dec. 31, 2014
Equity, Class of Treasury Stock      
Number of shares repurchased and retired under the stock repurchase program 722,000us-gaap_StockRepurchasedAndRetiredDuringPeriodShares    
Value of shares repurchased and retired under the stock repurchase program excluding commissions paid $ 4,820wifi_StockRepurchasedDuringPeriodValueExcludingCommissionsPaid    
Average price under the stock repurchase program (in dollars per share) $ 6.68wifi_StockRepurchaseProgramAverageRepurchasePrice    
Remaining amount authorized for the share repurchase program     5,180us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1
Maximum      
Equity, Class of Treasury Stock      
Amount of common stock approved by the entity for a stock repurchase program   $ 10,000wifi_AmountOfCommonStockApprovedByEntityForStockRepurchaseProgram
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