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Marketable Securities (Tables)
6 Months Ended 12 Months Ended
Jun. 30, 2020
Dec. 31, 2019
Investments Debt And Equity Securities [Abstract]    
Schedule of Fair Value Marketable Securities By Type of Security As of December 31, 2019, the fair value of marketable securities by type of security was as follows (in thousands):
Description
  
Amortized
Cost
    
Unrealized
Gains
    
Unrealized
Losses
    
Fair
Value
 
U.S. government agency treasuries and securities
   $ 57,650      $ 49      $ —        $ 57,699  
  
 
 
    
 
 
    
 
 
    
 
 
 
Total
   $ 57,650      $ 49      $ —        $ 57,699  
  
 
 
    
 
 
    
 
 
    
 
 
 
As of December 31, 2019, the fair value of marketable securities by type of security was as follows (in thousands):
 
Description
  
Amortized
Cost
    
Unrealized
Gains
    
Unrealized
Losses
    
Fair
Value
 
U.S. government agency treasuries and securities
   $ 57,650      $ 49      $ —        $ 57,699  
  
 
 
    
 
 
    
 
 
    
 
 
 
Total
   $ 57,650      $ 49      $ —        $ 57,699  
  
 
 
    
 
 
    
 
 
    
 
 
 
As of December 31, 2018, the fair value of marketable securities by type of security was as following (in thousands):
 
Description
  
Amortized
Cost
    
Unrealized
Gains
    
Unrealized
Losses
    
Fair

Value
 
U.S. government agency treasuries and securities
   $ 101,027      $ 4      $ (45    $ 100,986  
  
 
 
    
 
 
    
 
 
    
 
 
 
Total
   $ 101,027      $ 4      $ (45    $ 100,986  
  
 
 
    
 
 
    
 
 
    
 
 
 
Schedule of Fair Value and Amortized Cost of Company's Available-for-Sale Securities by Contractual Maturity
The estimated fair value and amortized cost of the Company’s
available-for-sale
securities by contractual maturity are summarized as follows (in thousands):
    
December 31, 2019
 
    
Amortized
Cost
    
Fair
Value
 
Due in one year or less
   $ 57,650      $ 57,699  
  
 
 
    
 
 
 
Total
   $ 57,650      $ 57,699  
  
 
 
    
 
 
 
The estimated fair value and amortized cost of the Company’s
available-for-sale
securities by contractual maturity are summarized as follows:
 
    
December 31, 2019
 
    
Amortized Cost
    
Fair Value
 
    
(In thousands)
 
Due in one year or less
   $ 57,650      $ 57,699  
  
 
 
    
 
 
 
Total
   $ 57,650      $ 57,699  
  
 
 
    
 
 
 
 
    
December 31, 2018
 
    
Amortized Cost
    
Fair Value
 
    
(In thousands)
 
Due in one year or less
   $ 101,027      $ 100,986  
  
 
 
    
 
 
 
Total
   $ 101,027      $ 100,986