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Available-for-Sale Securities | 3 Months Ended
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Mar. 31, 2023
Investments, Debt and Equity Securities [Abstract] |
Available-for-Sale Securities | 6. Available-for-Sale Securities As of March 31, 2023, the fair value of available-for-sale securities by type of security was as follows:
|  | March 31, 2023 |
|  | Amortized Cost |  |  | Gross Unrealized Gain |  |  | Gross Unrealized Loss |  |  | Fair Value |
Investments: |  |  |  |  |  |  |  |  |  |  |  |
Treasury bills |  | $ | 19,989 |  |  | $ | 5 |  |  | $ | — |  |  | $ | 19,994 |
Corporate bond securities |  |  | 866 |  |  |  | — |  |  |  | — |  |  |  | 866 |
|  | $ | 20,855 |  |  | $ | 5 |  |  | $ | — |  |  | $ | 20,860 |
As of December 31, 2022, the fair value of available-for-sale securities by type of security was as follows:
|  | December 31, 2022 |
|  | Amortized Cost |  |  | Gross Unrealized Gain |  |  | Gross Unrealized Loss |  |  | Fair Value |
Investments: |  |  |  |  |  |  |  |  |  |  |  |
Treasury bill |  | $ | 34,780 |  |  | $ | — |  |  | $ | (30 | ) |  | $ | 34,750 |
Corporate bond securities |  |  | 23,626 |  |  |  | — |  |  |  | (38 | ) |  |  | 23,588 |
|  | $ | 58,406 |  |  | $ | — |  |  | $ | (68 | ) |  | $ | 58,338 |
The estimated fair value and amortized cost of the Company’s available-for-sale securities as of March 31, 2023 by contractual maturity are summarized as follows:
|  | March 31, 2023 |
|  | Amortized Cost |  |  | Fair Value |
Due in one year or less |  | $ | 20,855 |  |  | $ | 20,860 |
Total available-for-sale securities |  | $ | 20,855 |  |  | $ | 20,860 |
The weighted average maturity of the Company’s available-for-sale securities as of March 31, 2023 was approximately 0.5 years. The estimated fair value and amortized cost of the Company’s available-for-sale securities as of December 31, 2022 by contractual maturity are summarized as follows:
|  | December 31, 2022 |
|  | Amortized Cost |  |  | Fair Value |
Due in one year or less |  | $ | 58,406 |  |  | $ | 58,338 |
Total available-for-sale securities |  | $ | 58,406 |  |  | $ | 58,338 |
The weighted average maturity of the Company’s available-for-sale securities as of December 31, 2022 was approximately 0.5 years.

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- Definition The entire disclosure for investments in certain debt and equity securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -URI https://asc.fasb.org/subtopic&trid=2209399 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -URI https://asc.fasb.org/subtopic&trid=2324412 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -URI https://asc.fasb.org/topic&trid=2196928 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 940 -SubTopic 320 -URI https://asc.fasb.org/subtopic&trid=2176304 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 1403 -Paragraph (b) + Details
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