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Short-term Investments | 9 Months Ended
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Sep. 30, 2023
Short-Term Investments [Abstract] |
Short-term Investments | 5. Short-term Investments The following is a summary of our short-term investments (in thousands):
|  | September 30, 2023 |
|  |  |  |  | Gross |  |  | Gross |  |  |  |
|  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  | Estimated |
|  | Cost |  |  | Gains |  |  | Losses |  |  | Fair Value |
U.S. treasury bills and government agency obligations |  | $ | 28,091 |  |  | $ | 1 |  |  | $ | — |  |  | $ | 28,092 |
U.S. corporate debt securities |  |  | 8,049 |  |  |  | — |  |  |  | (1 | ) |  |  | 8,048 |
Foreign corporate debt securities |  |  | 2,480 |  |  |  | — |  |  |  | (1 | ) |  |  | 2,479 |
U.S. commercial paper |  |  | 1,962 |  |  |  | — |  |  |  | — |  |  |  | 1,962 |
Foreign commercial paper |  |  | 1,972 |  |  |  | — |  |  |  | — |  |  |  | 1,972 |
Total |  | $ | 42,554 |  |  | $ | 1 |  |  | $ | (2 | ) |  | $ | 42,553 |
|  | December 31, 2022 |
|  |  |  |  | Gross |  |  | Gross |  |  |  |
|  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  | Estimated |
|  | Cost |  |  | Gains |  |  | Losses |  |  | Fair Value |
U.S. treasury bills and government agency obligations |  | $ | 35,734 |  |  | $ | — |  |  | $ | (19 | ) |  | $ | 35,715 |
U.S. commercial paper |  |  | 5,481 |  |  |  | — |  |  |  | — |  |  |  | 5,481 |
Foreign commercial paper |  |  | 28,292 |  |  |  | — |  |  |  | — |  |  |  | 28,292 |
Total |  | $ | 69,507 |  |  | $ | — |  |  | $ | (19 | ) |  | $ | 69,488 |
The amortized cost of debt securities is adjusted for amortization of premiums and accretion of discounts to maturity. We regularly monitor and evaluate the realizable value of our marketable securities. We did no t recognize any impairment losses during the three and nine months ended September 30, 2023 and 2022. Unrealized gains and losses associated with our investments are reported in accumulated other comprehensive income (loss). Realized gains and losses associated with our investments, if any, are reported in the statements of operations and comprehensive loss. We recognized $1,000 in realized losses during the three and nine months ended September 30, 2023. We did no t recognize any realized gains or losses during the three and nine months ended September 30, 2022.

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- Definition The entire disclosure for investments in certain debt and equity securities. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org//320/tableOfContent Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 10 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-10 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6B -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-6B Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6B -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-6B Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Name Regulation S-K (SK) -Number 229 -Section 1403 -Paragraph (b) -Publisher SEC Reference 6: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 946 -SubTopic 320 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org//946-320/tableOfContent Reference 7: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 940 -SubTopic 320 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org//940-320/tableOfContent Reference 8: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 320 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org//942-320/tableOfContent + Details
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