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Financial Instruments (Tables)
3 Months Ended
Mar. 31, 2020
Investments, Debt and Equity Securities [Abstract]  
Schedule Of Available For Sale Securities
The par value, amortized cost, gross unrealized gains and losses and estimated fair value of investments classified as available for sale as of March 31, 2020 and December 31, 2019 are as follows (in thousands):
March 31, 2020
Par Value
 
Amortized Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Level 1
 
Level 2
 
Total Fair Value
Measurements
Certificates of Deposit
$
10,250

 
$
10,250

 
$
25

 
$

 
$

 
$
10,275

 
$
10,275

December 31, 2019
Par Value
 
Amortized Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Level 1
 
Level 2
 
Total Fair Value
Measurements
Certificates of Deposit
$
10,000

 
$
10,000

 
$
8

 
$
(2
)
 
$

 
$
10,006

 
$
10,006