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Cash, Cash Equivalents and Marketable Securities (Tables)
9 Months Ended
Sep. 30, 2017
Investments in Marketable Securities

Investments in marketable securities consisted of the following at December 31, 2016 (in thousands):

 

     December 31, 2016  
     Amortized
Cost
     Gross
Unrealized
Gain
     Gross
Unrealized
Loss
     Fair
Value
 

Marketable securities:

           

U.S. Government and agency securities

   $ 807      $ —        $ —        $ 807  

Corporate and other debt securities

     18,745        2        (7      18,740  
  

 

 

    

 

 

    

 

 

    

 

 

 

Total

   $ 19,552      $ 2      $ (7    $ 19,547