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Property and Equipment, Net (Tables)
 12 Months Ended
Dec. 31, 2014
Property, Plant and Equipment [Abstract]  
Schedule of Property and Equipment

Property and equipment consists of the following:

 

    Estimated Useful Life   As of December 31,  
    (in years)   2013     2014  
Cost:                    
Computer hardware and software   2 - 5   $ 1,239     $ 1,173  
Equipment   3 - 14     1,216       648  
Leasehold improvements   Term of lease     1,082       1,337  
          3,537       3,158  
Accumulated depreciation and amortization                    
Computer hardware and software         772       694  
Equipment         1,194       911  
Leasehold improvements         425       473  
          2,391       2,078  
Property and equipment, net       $ 1,146     $ 1,080