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Fair Value Measurements (Tables)
 6 Months Ended
Jun. 30, 2015
Fair Value Disclosures [Abstract]  
Schedule of assets measured at fair value on a recurring basis
    Fair Value Measurement at June 30, 2015 Using:
   

Quoted Prices in
Active Markets for

Identical Assets

    

 

Significant Other
Observable Inputs

     Significant
Unobservable
Inputs		  
      (Level 1)       (Level 2)       (Level 3)  
Corporate debt securities   $ 856     $ -     $ -  
Money market funds (included in cash and cash equivalents)     34,311                  
 Total   $ 35,167     $ -     $ -  

 

 

    Fair Value Measurement at December 31, 2014 Using:
   

Quoted Prices in
Active Markets for

Identical Assets

    

Significant Other
Observable Inputs

     Significant
Unobservable
Inputs		  
      (Level 1)       (Level 2)       (Level 3)  
Corporate debt securities   $ 1,428     $ -     $ -  
Money market funds (included in cash and cash equivalents)     34,339                  
 Total   $ 35,767     $ -     $ -