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PROPERTY AND EQUIPMENT (Tables)
 12 Months Ended
Dec. 31, 2014
Property, Plant and Equipment [Abstract]  
Summarizes Components of Property and Equipment, Net
The following table summarizes components of property and equipment, net for each of the periods indicated:

 

     As of December 31,  
     2014      2013  
     (in thousands)  

Land

    $ 4,158       $ —     

Building

      12,617         1,856   

Software and computer equipment

      4,415         225   

Lab equipment

      11,772         7,728   

Office equipment

      2,713         1,207   

Leasehold improvements

      21,640         10,058   

Construction in progress

      1,082         11,303   
  

 

 

     

 

 

  

Property and equipment, gross

      58,397         32,377   

Less accumulated depreciation

      (19,896 )       (17,328 )
  

 

 

     

 

 

  

Property and equipment, net

    $ 38,501       $ 15,049