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Investments - Available-for-Sale
6 Months Ended
Jun. 30, 2022
Investments, Debt and Equity Securities [Abstract]  
Investments - Available-for-Sale Investments - Available-for-Sale
As of June 30, 2022, all investment available-for-sale securities have been liquidated.
Investments available-for-sale consisted of the following as of December 31, 2021 (table in thousands):

December 31, 2021
Amortized CostUnrealized GainUnrealized LossAccrued InterestFair Value
Available-for-Sale Securities
Bonds$9,143 $$— $14 $9,158 
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 December 31, 2021, the amortized cost and estimated fair value of our available-for-sale securities were due within one year.