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Property and equipment
 12 Months Ended
Dec. 31, 2013
Property and equipment

4. Property and equipment

Property and equipment consist of the following (dollar amounts in thousands):

 

     Estimated
Useful
Life
(Years)		      December 31,  
        2012     2013  

Land

      —       $ 5,273      $ 5,273   

Buildings

      39-40         54,948        54,948   

Building improvements

      5-40         114,245        114,099   

Machinery and equipment

      3-15         81,382        82,189   

Furniture, fixtures and office equipment

      5-10         5,239        5,046   

Computer equipment and software

      3         11,840        11,289   

Leasehold improvements

      4         17        17   

Construction in progress

         12,266        14,756   
     

 

 

    

 

 

  
        285,210        287,617   

Less accumulated depreciation and amortization

         (101,249 )      (111,060 ) 
     

 

 

    

 

 

  

Total property and equipment, net

       $ 183,961      $ 176,557   
     

 

 

    

 

 

  

 

Leasehold improvements are amortized over four years which is the shorter of the term of the lease or the service lives of the improvements. Depreciation and amortization expense related to property and equipment for the years ended December 31, 2011, 2012 and 2013, and the cumulative period from February 14, 1991 (date of inception) to December 31, 2013 was $14.6 million, $13.0 million, $11.5 million and $133.3 million, respectively.

No asset impairment was recognized during the years ended December 31, 2011, 2012 and 2013.

In December 2009, the Company recognized a loss on disposal of approximately $12.8 million in research and development expense related to the abandonment of first-generation inhaler specific assets which would no longer be used as the Company pursued the commercialization of the next-generation device.