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Financial Instruments (Tables)
 9 Months Ended
Sep. 30, 2021
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 September 30, 2021 and December 31, 2020 are as follows (in thousands):
September 30, 2021Par ValueAmortized CostGross
Unrealized
Gains		Gross
Unrealized
Losses		Level 1Level 2Total Fair Value
Measurements
Certificates of Deposit$10,750 $10,750 $— $(2)$— $10,748 $10,748 
December 31, 2020Par ValueAmortized CostGross
Unrealized
Gains		Gross
Unrealized
Losses		Level 1Level 2Total Fair Value
Measurements
Certificates of Deposit$8,500 $8,500 $7 $— $— $8,507 $8,507