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Fair Value Measurements (Tables)
 9 Months Ended
Sep. 30, 2017
Fair Value Disclosures [Abstract]  
Schedule of assets measured at fair value on a recurring basis
    Fair Value Measurement at September 30, 2017 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   $ -     $ -     $ -  
Money market funds (included in cash and cash equivalents)     46,952                  
Total   $ 46,952     $ -     $ -  

 

    Fair Value Measurement at December 31, 2016 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   $ 951     $ -     $ -  
Money market funds (included in cash and cash equivalents)     49,839                  
Total   $ 50,790     $ -     $ -