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Investments - Available-for-Sale
6 Months Ended
Jun. 30, 2023
Investments, Debt and Equity Securities [Abstract]  
Investments - Available-for-Sale Investments - Available-for-Sale
Investments available-for-sale consisted of the following as of June 30, 2023 and December 31, 2022 (table in thousands):
June 30, 2023
Amortized CostUnrealized GainUnrealized LossAccrued InterestFair Value
Available-for-Sale Securities
Debt securities$5,852 $54 $— $— $5,906 

December 31, 2022
Amortized CostUnrealized GainUnrealized LossAccrued InterestFair Value
Available-for-Sale Securities
Debt securities$11,315 $75 $— $— $11,390 
The fair value of investments available-for-sale are determined using quoted market prices from daily exchange-traded markets based on the closing price as of the balance sheet date and are classified as a Level 1 measurement under ASC 820 Fair Value Measurements.
As of June 30, 2023 and December 31, 2022, the amortized cost and estimated fair value of our available-for-sale securities were all due within one year.