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Summary of significant accounting policies (Details 2) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Marketable securities      
Short-term marketable securities $ 1,614us-gaap_AvailableForSaleSecuritiesCurrent $ 32,962us-gaap_AvailableForSaleSecuritiesCurrent  
Long-term marketable securities 0us-gaap_AvailableForSaleSecuritiesNoncurrent 0us-gaap_AvailableForSaleSecuritiesNoncurrent 0us-gaap_AvailableForSaleSecuritiesNoncurrent
Unrealized gains or losses in accumulated other comprehensive income (loss) 0us-gaap_AccumulatedOtherComprehensiveIncomeLossBeforeTax1 0us-gaap_AccumulatedOtherComprehensiveIncomeLossBeforeTax1  
Restricted cash      
Restricted cash 0us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue 545us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue  
Short-term restricted cash related to letters of credit   545us-gaap_CashCollateralForBorrowedSecurities  
Restricted cash classified as long-term   0us-gaap_RestrictedCashAndCashEquivalentsNoncurrent  
Business combinations      
Transaction costs associated with business combinations $ 0us-gaap_BusinessCombinationAcquisitionRelatedCosts $ 354us-gaap_BusinessCombinationAcquisitionRelatedCosts $ 50us-gaap_BusinessCombinationAcquisitionRelatedCosts
Total Revenue | Affiliated entities      
Concentrations of credit risk      
Concentration risk percentage 15.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesMember
/ dei_LegalEntityAxis
= us-gaap_AffiliatedEntityMember
   
Number of groups of affiliated entities 1wifi_NumberOfGroupsOfAffiliatedEntities
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesMember
/ dei_LegalEntityAxis
= us-gaap_AffiliatedEntityMember
2wifi_NumberOfGroupsOfAffiliatedEntities
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesMember
/ dei_LegalEntityAxis
= us-gaap_AffiliatedEntityMember
2wifi_NumberOfGroupsOfAffiliatedEntities
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesMember
/ dei_LegalEntityAxis
= us-gaap_AffiliatedEntityMember
Total Revenue | Affiliated entities group one      
Concentrations of credit risk      
Concentration risk percentage   14.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesMember
/ dei_LegalEntityAxis
= wifi_AffiliatedEntityGroupOneMember
17.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesMember
/ dei_LegalEntityAxis
= wifi_AffiliatedEntityGroupOneMember
Total Revenue | Affiliated entities group two      
Concentrations of credit risk      
Concentration risk percentage   14.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesMember
/ dei_LegalEntityAxis
= wifi_AffiliatedEntityGroupTwoMember
15.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesMember
/ dei_LegalEntityAxis
= wifi_AffiliatedEntityGroupTwoMember
Total accounts receivable | Affiliated entities      
Concentrations of credit risk      
Concentration risk percentage   12.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_AccountsReceivableMember
/ dei_LegalEntityAxis
= us-gaap_AffiliatedEntityMember
 
Number of groups of affiliated entities 2wifi_NumberOfGroupsOfAffiliatedEntities
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_AccountsReceivableMember
/ dei_LegalEntityAxis
= us-gaap_AffiliatedEntityMember
1wifi_NumberOfGroupsOfAffiliatedEntities
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_AccountsReceivableMember
/ dei_LegalEntityAxis
= us-gaap_AffiliatedEntityMember
 
Total accounts receivable | Affiliated entities group one      
Concentrations of credit risk      
Concentration risk percentage 30.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_AccountsReceivableMember
/ dei_LegalEntityAxis
= wifi_AffiliatedEntityGroupOneMember
   
Total accounts receivable | Affiliated entities group two      
Concentrations of credit risk      
Concentration risk percentage 17.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_AccountsReceivableMember
/ dei_LegalEntityAxis
= wifi_AffiliatedEntityGroupTwoMember