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Property and equipment
12 Months Ended
Dec. 31, 2012
Property and equipment  
Property and equipment

7. Property and equipment

        Property and equipment consisted of the following:

 
  December 31,  
 
  2012   2011  

Leasehold improvements

  $ 72,119   $ 60,030  

Construction in progress

    6,295     7,059  

Computer equipment

    7,493     6,674  

Software

    7,519     5,818  

Office equipment

    411     400  
           

Total property and equipment

    93,837     79,981  

Less: accumulated depreciation and amortization

    (51,426 )   (40,264 )
           

Total property and equipment, net

  $ 42,411   $ 39,717  
           

        Included in property and equipment at December 31, 2012 and 2011 was software and equipment acquired under capital leases totaling $402, respectively, and related accumulated depreciation and amortization of $224 and $0, respectively.

        Depreciation and amortization expense is allocated as follows on the accompanying consolidated statements of operations:

 
  For the Years Ended
December 31,
 
 
  2012   2011   2010  

Network access

  $ 11,948   $ 8,867   $ 4,392  

Network operations

    2,844     2,444     1,747  

Development and technology

    1,049     873     1,024  

General and administrative

    117     117     348  
               

Total depreciation and amortization of property and equipment

  $ 15,958   $ 12,301   $ 7,511