v2.4.0.6
Property and equipment (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Dec. 31, 2011
Property and equipment          
Total property and equipment $ 91,970   $ 91,970   $ 79,981
Less: accumulated depreciation and amortization (48,111)   (48,111)   (40,264)
Total property and equipment, net 43,859   43,859   39,717
Depreciation and amortization allocation          
Total depreciation and amortization of property and equipment 3,358 2,810 7,873 5,339  
Network access
          
Depreciation and amortization allocation          
Total depreciation and amortization of property and equipment 479 1,927 6,144 3,659  
Network operations
          
Depreciation and amortization allocation          
Total depreciation and amortization of property and equipment 716 620 1,390 1,178  
Development and technology
          
Depreciation and amortization allocation          
Total depreciation and amortization of property and equipment 130 237 280 439  
General and administrative
          
Depreciation and amortization allocation          
Total depreciation and amortization of property and equipment 33 26 59 63  
Leasehold improvements
          
Property and equipment          
Total property and equipment 73,054   73,054   60,030
Construction in progress
          
Property and equipment          
Total property and equipment 5,534   5,534   7,059
Computer equipment
          
Property and equipment          
Total property and equipment 7,016   7,016   6,674
Software
          
Property and equipment          
Total property and equipment 5,955   5,955   5,818
Office equipment
          
Property and equipment          
Total property and equipment $ 411   $ 411   $ 400