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Fair Value Measurements (Tables)
9 Months Ended
Sep. 30, 2018
Fair Value Disclosures [Abstract]  
Schedule of assets measured at fair value on a recurring basis
    Fair Value Measurement at September 30, 2018 Using:  
    Quoted Prices in
Active Markets for
Identical Assets
    Significant Other
Observable Inputs
    Significant
Unobservable
Inputs
 
    (Level 1)     (Level 2)     (Level 3)  
Money market funds (included in cash and cash equivalents)   $ 47,814                  
Total   $ 47,814     $      -     $      -  

 

    Fair Value Measurement at December 31, 2017 Using:  
    Quoted Prices in
Active Markets for
Identical Assets
    Significant Other
Observable Inputs
    Significant
Unobservable
Inputs
 
    (Level 1)     (Level 2)     (Level 3)  
Money market funds (included in cash and cash equivalents)   $ 49,986                  
Total   $ 49,986     $      -     $      -