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Financial Instruments (Tables) | 12 Months Ended
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Dec. 31, 2022
Investments, Debt and Equity Securities [Abstract] |
Summary of Marketable Securities | The following is a summary of marketable securities at December 31, 2022 and December 31, 2021 (in thousands):
|  | December 31, 2022 |
|  | Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Allowance for Credit Losses |  |  | Estimated Fair Values |
Marketable securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate bonds and notes |  | $ | 29,018 |  |  | $ | 3 |  |  | $ | (6 | ) |  | $ | — |  |  | $ | 29,015 |
Total debt securities |  |  | 29,018 |  |  |  | 3 |  |  |  | (6 | ) |  |  |  |  |  | 29,015 |
Money market funds |  |  | 4,107 |  |  |  |  |  |  |  |  |  |  |  |  | 4,107 |
Total equity securities |  |  | 4,107 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 4,107 |
Total marketable securities |  | $ | 33,125 |  |  | $ | 3 |  |  | $ | (6 | ) |  | $ | — |  |  | $ | 33,122 |
Reported in: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents |  |  |  |  |  |  |  |  |  |  |  |  |  | $ | 33,122 |
|  | December 31, 2021 |
|  | Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Allowance for Credit Losses |  |  | Estimated Fair Values |
Marketable securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate bonds and notes |  | $ | 40,466 |  |  | $ | — |  |  | $ | (53 | ) |  | $ | — |  |  | $ | 40,413 |
Commercial paper |  |  | 49,609 |  |  |  | — |  |  |  | (18 | ) |  |  | — |  |  |  | 49,591 |
Total debt securities |  |  | 90,075 |  |  |  | — |  |  |  | (71 | ) |  |  | — |  |  |  | 90,004 |
Money market funds |  |  | 12,372 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 12,372 |
Total equity securities |  |  | 12,372 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 12,372 |
Total marketable securities |  | $ | 102,447 |  |  | $ | — |  |  | $ | (71 | ) |  | $ | — |  |  | $ | 102,376 |
Reported in: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents |  |  |  |  |  |  |  |  |  |  |  |  |  | $ | 41,842 |
Available-for-sale debt securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 60,534 |
Total marketable securities |  |  |  |  |  |  |  |  |  |  |  |  |  | $ | 102,376 |
Fair Value and Gross Unrealized Losses Related to Individual Available-for-Sale Debt Securities | The following table summarizes the fair value and gross unrealized losses related to individual debt securities at December 31, 2022 and 2021, which have been in a continuous unrealized loss position, aggregated by investment category and length of time (in thousands):
December 31, 2022 |  | Less Than 12 Months |  |  | 12 Months or More |  |  | Total |  |  | Fair Value |
|  | Fair Value |  |  | Gross Unrealized Losses |  |  | Fair Value |  |  | Gross Unrealized Losses |  |  | Fair Value |  |  | Gross Unrealized Losses |  |  | Cash and Cash Equivalents |  | AFS Debt Securities |
Commercial paper |  | $ | 29,015 |  |  | $ | (6 | ) |  | $ | — |  |  | $ | — |  |  | $ | 29,015 |  |  | $ | (6 | ) |  | $ | 29,015 |  | $ | — |
December 31, 2021 |  | Less Than 12 Months |  |  | 12 Months or More |  |  | Total |  |  | Fair Value |
|  | Fair Value |  |  | Gross Unrealized Losses |  |  | Fair Value |  |  | Gross Unrealized Losses |  |  | Fair Value |  |  | Gross Unrealized Losses |  |  | Cash and Cash Equivalents |  |  | AFS Debt Securities |
Corporate bonds and notes |  | $ | 29,807 |  |  | $ | (45 | ) |  | $ | 10,382 |  |  | $ | (8 | ) |  | $ | 40,189 |  |  | $ | (53 | ) |  | $ | - |  |  | $ | 40,189 |
Commercial paper |  |  | 48,091 |  |  |  | (18 | ) |  |  | — |  |  |  | — |  |  |  | 48,091 |  |  |  | (18 | ) |  |  | 29,470 |  |  |  | 18,621 |
Total |  | $ | 77,898 |  |  | $ | (63 | ) |  | $ | 10,382 |  |  | $ | (8 | ) |  | $ | 88,280 |  |  | $ | (71 | ) |  | $ | 29,470 |  |  | $ | 58,810 |
Estimated Fair Value of Marketable Debt Securities by Contractual Maturity | The estimated fair value of marketable debt securities by contractual maturity at December 31, 2022 is shown below (in thousands). Actual maturities may differ from contractual maturities because issuers may have the right to call or prepay obligations without call or prepayment penalties.
|  | Estimated Fair Value |
Due in one year or less |  | $ | 29,015 |

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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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