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Investments | 6 Months Ended
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Jun. 30, 2022
Investments [Abstract] |
Investments | Investments The following tables summarize the fair value of the Company’s investments by type. The estimated fair values of the Company’s fixed income investments are classified as Level 2 in the fair value hierarchy as defined in U.S. GAAP. These valuations are based on observable direct and indirect inputs, primarily quoted prices of similar, but not identical, instruments in active markets or quoted prices for identical or similar instruments in markets that are not active. These fair values are obtained from independent pricing services which utilize Level 2 inputs.
| June 30, 2022
| Amortized Cost |  | Accrued Interest |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Estimated Fair Value
Obligations of U.S. Government and its agencies | $ | 137,222 |  |  | $ | 135 |  |  | $ | 2 |  |  | $ | (393) |  |  | $ | 136,966 |
Corporate debt securities | 6,299 |  |  | 47 |  |  | — |  |  | (38) |  |  | 6,308 |
Certificates of deposit | 1,644 |  |  | 8 |  |  | — |  |  | (14) |  |  | 1,638 |
Total investments | $ | 145,165 |  |  | $ | 190 |  |  | $ | 2 |  |  | $ | (445) |  |  | $ | 144,912 |
| December 31, 2021
| Amortized Cost |  | Accrued Interest |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Estimated Fair Value
Obligations of U.S. Government and its agencies | $ | 4,043 |  |  | $ | 17 |  |  | $ | — |  |  | $ | (7) |  |  | $ | 4,053 |
Corporate debt securities | 4,294 |  |  | 40 |  |  | — |  |  | (5) |  |  | 4,329 |
Certificates of deposit | 1,652 |  |  | 8 |  |  | — |  |  | (1) |  |  | 1,659 |
Total investments | $ | 9,989 |  |  | $ | 65 |  |  | $ | — |  |  | $ | (13) |  |  | $ | 10,041 |
The following table summarizes the scheduled maturity for the Company’s investments at June 30, 2022 and December 31, 2021:
| June 30, 2022 |  | December 31, 2021
Maturing in one year or less | $ | 144,912 |  |  | $ | 3,212 |
Maturing after one year through two years | — |  |  | 6,829 |
Total investments | $ | 144,912 |  |  | $ | 10,041 |

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