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Marketable Securities (Tables) | 3 Months Ended
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Mar. 31, 2023
Investments, Debt and Equity Securities [Abstract] |
Summary of Marketable Securities Accounted for Available-for-Sale Securities | The following tables summarize the Company’s marketable securities accounted for as available-for-sale securities (in thousands, except years):
|  | March 31, 2023 |
|  | Maturity |  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  | Estimated |
|  | (in years) |  | cost |  |  | gains |  |  | losses |  |  | fair value |
US treasury securities |  | 1 or less |  | $ | 89,411 |  |  | $ | 13 |  |  | $ | (532 | ) |  | $ | 88,892 |
US government agency securities |  | 1 or less |  |  | 9,525 |  |  |  | 13 |  |  |  | — |  |  |  | 9,538 |
Corporate debt securities |  | 1 or less |  |  | 3,308 |  |  |  | 1 |  |  |  | (3 | ) |  |  | 3,306 |
Commercial paper |  | 1 or less |  |  | 14,607 |  |  |  | 1 |  |  |  | (5 | ) |  |  | 14,603 |
Supranational debt securities |  | 1 or less |  |  | 648 |  |  |  | — |  |  |  | (2 | ) |  |  | 646 |
Total |  |  |  | $ | 117,499 |  |  | $ | 28 |  |  | $ | (542 | ) |  | $ | 116,985 |
|  | December 31, 2022 |
|  | Maturity |  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  | Estimated |
|  | (in years) |  | cost |  |  | gains |  |  | losses |  |  | fair value |
US treasury securities |  | 1 or less |  | $ | 128,504 |  |  | $ | 5 |  |  | $ | (1,033 | ) |  | $ | 127,476 |
US government agency securities |  | 1 or less |  |  | 1,467 |  |  |  | 1 |  |  |  | — |  |  |  | 1,468 |
Corporate debt securities |  | 1 or less |  |  | 3,309 |  |  |  | — |  |  |  | (8 | ) |  |  | 3,301 |
Commercial paper |  | 1 or less |  |  | 18,519 |  |  |  | — |  |  |  | — |  |  |  | 18,519 |
Supranational debt securities |  | 1 or less |  |  | 645 |  |  |  | — |  |  |  | (6 | ) |  |  | 639 |
Total |  |  |  | $ | 152,444 |  |  | $ | 6 |  |  | $ | (1,047 | ) |  | $ | 151,403 |
Summary of Fair Values and Gross Unrealized Losses for Available-for-sale Securities | The following tables present fair values and gross unrealized losses for those available-for-sale securities that were in an unrealized loss position as of March 31, 2023 and December 31, 2022, aggregated by category and the length of time that the securities have been in a continuous loss position (in thousands):
|  | March 31, 2023 |
|  | Unrealized losses less than 12 months |  |  | Unrealized losses 12 months or greater |  |  | Total |
|  | Fair value |  |  | Unrealized losses |  |  | Fair value |  |  | Unrealized losses |  |  | Fair value |  |  | Unrealized losses |
US treasury securities |  | $ | 37,143 |  |  | $ | (48 | ) |  | $ | 29,483 |  |  | $ | (484 | ) |  | $ | 66,626 |  |  | $ | (532 | )
Corporate debt securities |  |  | 2,567 |  |  |  | (3 | ) |  |  | — |  |  |  | — |  |  |  | 2,567 |  |  |  | (3 | )
Commercial paper |  |  | 9,389 |  |  |  | (5 | ) |  |  | — |  |  |  | — |  |  |  | 9,389 |  |  |  | (5 | )
Supranational debt securities |  |  | 646 |  |  |  | (2 | ) |  |  | — |  |  |  | — |  |  |  | 646 |  |  |  | (2 | )
Total |  | $ | 49,745 |  |  | $ | (58 | ) |  | $ | 29,483 |  |  | $ | (484 | ) |  | $ | 79,228 |  |  | $ | (542 | )
|  | December 31, 2022 |
|  | Unrealized losses less than 12 months |  |  | Unrealized losses 12 months or greater |  |  | Total |
|  | Fair value |  |  | Unrealized losses |  |  | Fair value |  |  | Unrealized losses |  |  | Fair value |  |  | Unrealized losses |
US treasury securities |  | $ | 60,652 |  |  | $ | (129 | ) |  | $ | 44,048 |  |  | $ | (904 | ) |  | $ | 104,700 |  |  | $ | (1,033 | )
Corporate debt securities |  |  | 2,560 |  |  |  | (8 | ) |  |  | — |  |  |  | — |  |  |  | 2,560 |  |  |  | (8 | )
Supranational debt securities |  |  | 639 |  |  |  | (6 | ) |  |  | — |  |  |  | — |  |  |  | 639 |  |  |  | (6 | )
Total |  | $ | 63,851 |  |  | $ | (143 | ) |  | $ | 44,048 |  |  | $ | (904 | ) |  | $ | 107,899 |  |  | $ | (1,047 | )

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- Definition Tabular disclosure of marketable securities. This may consist of investments in certain debt and equity securities, short-term investments and other assets. + References No definition available. + Details
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- Definition For all investments in an unrealized loss position, including those for which other-than-temporary impairments have not been recognized in earnings (including investments for which a portion of an other-than-temporary impairment has been recognized in other comprehensive income), a tabular disclosure of the aggregate related fair value of investments with unrealized losses and the aggregate amount of unrealized losses (that is, the amount by which amortized cost basis exceeds fair value). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27290-111563 + Details
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