Summary of Fair Value of Available-for-Sale Investments by Type of Security |
The fair value of available-for-sale investments by type of security was as follows:
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December 31, 2021 |
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Amortized Cost |
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Unrealized Gains |
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Unrealized Losses |
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Fair Value |
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Investments: |
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U.S treasury bills |
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$ |
189,406 |
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$ |
(228 |
) |
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$ |
189,178 |
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U.S agency securities |
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|
108,895 |
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(138 |
) |
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|
108,757 |
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Total investments with a maturity of one year or less |
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298,301 |
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— |
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(366 |
) |
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297,935 |
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U.S treasury bills |
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280,743 |
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(535 |
) |
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280,208 |
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U.S agency securities |
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99,998 |
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(187 |
) |
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|
99,811 |
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Total investments with a maturity of one to two years |
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380,741 |
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— |
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(722 |
) |
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|
380,019 |
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Total investments |
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$ |
679,042 |
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$ |
— |
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$ |
(1,088 |
) |
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$ |
677,954 |
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December 31, 2020 |
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|
Amortized Cost |
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|
Unrealized Gains |
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|
Unrealized Losses |
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|
Fair Value |
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Investments: |
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U.S treasury bills |
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$ |
29,997 |
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|
$ |
21 |
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|
$ |
— |
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|
$ |
30,018 |
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U.S agency securities |
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|
20,996 |
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|
5 |
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— |
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|
21,001 |
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Total investments with a maturity of one year or less |
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50,993 |
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26 |
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— |
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51,019 |
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U.S treasury bills |
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|
3,008 |
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|
— |
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— |
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|
3,008 |
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U.S agency securities |
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|
176,350 |
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38 |
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— |
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|
176,388 |
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Total investments with a maturity of one to two years |
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179,358 |
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38 |
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— |
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|
179,396 |
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Total investments |
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$ |
230,351 |
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|
$ |
64 |
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|
$ |
— |
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$ |
230,415 |
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