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Investments (Tables) | 6 Months Ended
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Jun. 30, 2022
Investments [Abstract] |
Fair Value of the Company's Investments by Type | 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 |
Schedule of the Maturity of Investments | 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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- Definition Tabular disclosure of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -URI https://asc.fasb.org/topic&trid=2196928 + Details
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- Definition Tabular disclosure of information about investment in debt security measured at amortized cost (held-to-maturity). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5B -URI https://asc.fasb.org/extlink&oid=126970911&loc=SL120269825-111563 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5A -URI https://asc.fasb.org/extlink&oid=126970911&loc=SL120269820-111563 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27232-111563 + Details
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