v2.4.0.6
Property and equipment (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Dec. 31, 2011
Property and equipment          
Total property and equipment $ 97,906   $ 97,906   $ 79,981
Less: accumulated depreciation and amortization (51,936)   (51,936)   (40,264)
Total property and equipment, net 45,971   45,971   39,717
Depreciation and amortization allocation          
Total depreciation and amortization of property and equipment 3,798 3,555 11,672 8,894  
Network access
          
Depreciation and amortization allocation          
Total depreciation and amortization of property and equipment 2,704 2,637 8,848 6,295  
Network operations
          
Depreciation and amortization allocation          
Total depreciation and amortization of property and equipment 687 664 2,077 1,842  
Development and technology
          
Depreciation and amortization allocation          
Total depreciation and amortization of property and equipment 375 234 656 674  
General and administrative
          
Depreciation and amortization allocation          
Total depreciation and amortization of property and equipment 32 20 91 83  
Leasehold improvements
          
Property and equipment          
Total property and equipment 75,671   75,671   60,030
Construction in progress
          
Property and equipment          
Total property and equipment 7,264   7,264   7,059
Computer equipment
          
Property and equipment          
Total property and equipment 7,347   7,347   6,674
Software
          
Property and equipment          
Total property and equipment 7,213   7,213   5,818
Office equipment
          
Property and equipment          
Total property and equipment $ 411   $ 411   $ 400