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PROPERTY AND EQUIPMENT (Tables)
 3 Months Ended
Mar. 31, 2014
Property Plant And Equipment [Abstract]  
Summary of Company's Property and Equipment

The following table summarizes the Company’s property and equipment for each of the periods indicated:

 

     As of
March 31,
2014		     As of
December 31,
2013		  
     (in thousands)  

Lab equipment

    $ 8,332      $ 7,728   

Office equipment

      2,210        306   

Software and computer equipment

      2,955        1,126   

Building

      1,856        1,856   

Leasehold improvements

      21,359        10,058   

Construction in progress

      521        11,303   
  

 

 

    

 

 

  

Property and equipment, gross

      37,233        32,377   

Less: accumulated depreciation

      (17,103 )      (17,328 )
  

 

 

    

 

 

  

Property and equipment, net

    $ 20,130      $ 15,049