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Accrued Severance, Severance Assets and Retirement Plans (Tables)
12 Months Ended
Dec. 31, 2014
Compensation and Retirement Disclosure [Abstract]  
Breakdown of Company's Severance Liability and Severance Assets

    As of December 31,  
    2013     2014  
             
Current severance liability (included in Accrued payroll, payroll taxes and social benefits)   $ 151     $ 200  
Non-current severance liability     4,973       4,594  
Total severance liability   $ 5,124     $ 4,794  
                 
Amount of the total severance liability with respect to employees reaching legal retirement age in Israel in the next 10 years   $ 2,071     $ 1,588  
                 
                 
Current severance assets (included in Other current assets)   $ 137     $ 203  
Non-current severance assets     3,539       3,256  
Total severance assets   $ 3,676     $ 3,459  
                 
Amount of the total severance assets with respect to employees reaching legal retirement age in Israel in the next 10 years   $ 1,265     $ 1,156