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Investments (Tables) | 6 Months Ended
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Jun. 30, 2024
Investments, Debt and Equity Securities [Abstract] |
Debt Securities, Held-to-maturity | The following table summarizes adjusted cost, gross unrealized gains and losses, and fair value by significant investment category. The Company’s U.S. treasury and commercial paper investments with original maturities greater than 90 days are classified as held-to-maturity investments, and commercial paper investments with original maturities of 90 days or less are classified as cash equivalents on its condensed consolidated balance sheets as of June 30, 2024 and December 31, 2023, respectively.
| Amortized Cost |  | Gross Unrealized |  | Fair Value |  | Net Carrying Value
|  | Gains |  | Losses |  |
As of June 30, 2024 | (In Thousands)
Cash equivalents |  |  |  |  |  |  |  |  |
Commercial paper | $ | 4,937 |  |  | $ | 6 |  |  | $ | — |  |  | $ | 4,943 |  |  | $ | 4,937 |
Total cash equivalents | $ | 4,937 |  |  | $ | 6 |  |  | $ | — |  |  | $ | 4,943 |  |  | $ | 4,937 |
Investments |  |  |  |  |  |  |  |  |
U.S. treasury securities | $ | 3,502 |  |  | $ | — |  |  | $ | (2) |  |  | $ | 3,500 |  |  | $ | 3,502 |
Commercial paper | 10,871 |  |  | $ | — |  |  | (11) |  |  | 10,860 |  |  | 10,871 |
Total investments | $ | 14,373 |  |  | $ | — |  |  | $ | (13) |  |  | $ | 14,360 |  |  | $ | 14,373 |
| Amortized Cost |  | Gross Unrealized |  | Fair Value |  | Net Carrying Value
|  | Gains |  | Losses |  |
As of December 31, 2023 | (In Thousands)
Cash equivalents |  |  |  |  |  |  |  |  |
Commercial paper | $ | 4,976 |  |  | $ | 10 |  |  | $ | — |  |  | $ | 4,986 |  |  | $ | 4,976 |
Total cash equivalents | $ | 4,976 |  |  | $ | 10 |  |  | $ | — |  |  | $ | 4,986 |  |  | $ | 4,976 |
Investments |  |  |  |  |  |  |  |  |
Commercial Paper | $ | 16,799 |  |  | $ | — |  |  | $ | (10) |  |  | $ | 16,789 |  |  | $ | 16,799 |
Total investments | $ | 16,799 |  |  | $ | — |  |  | $ | (10) |  |  | $ | 16,789 |  |  | $ | 16,799 |
The amortized cost and fair value of held-to-maturity securities as of June 30, 2024 and December 31, 2023, by contractual maturity, are shown below.
As of June 30, 2024 | Amortized Cost |  | Fair Value
| (In Thousands)
Within one year | $ | 14,373 |  |  | $ | 14,360 |
After one year through five years | — |  |  | — |
After 5 years through 10 years | — |  |  | — |
After 10 years | — |  |  | — |
Total investments | $ | 14,373 |  |  | $ | 14,360 |
As of December 31, 2023 | Amortized Cost |  | Fair Value
| (In Thousands)
Within one year | $ | 16,799 |  |  | $ | 16,789 |
After one year through five years | — |  |  | — |
After 5 years through 10 years | — |  |  | — |
After 10 years | — |  |  | — |
Total investments | $ | 16,799 |  |  | $ | 16,789 |
Unrealized Gain (Loss) on Investments | For those securities in an unrealized loss position, the length of time the securities were in such a position is as follows:
| Less than 12 Months |  | Total
| # of Securities |  | Fair Value |  | Unrealized Losses |  | # of Securities |  | Fair Value |  | Unrealized Losses
As of June 30, 2024 | (Dollars In Thousands)
Investments |  |  |  |  |  |  |  |  |  |  |
U.S. treasury securities | 1 |  |  | $ | 3,500 |  |  | $ | (2) |  |  | 1 |  |  | $ | 3,500 |  |  | $ | (2) |
Commercial paper | 3 |  |  | 10,860 |  |  | (11) |  |  | 3 |  |  | 10,860 |  |  | (11) |
Total | 4 |  |  | $ | 14,360 |  |  | $ | (13) |  |  | 4 |  |  | $ | 14,360 |  |  | $ | (13) |
| Less than 12 Months |  | Total
| # of Securities |  | Fair Value |  | Unrealized Losses |  | # of Securities |  | Fair Value |  | Unrealized Losses
As of December 31, 2023 | (Dollars In Thousands)
Investments |  |  |  |  |  |  |  |  |  |  |
Commercial paper | 4 |  |  | $ | 16,789 |  |  | $ | (10) |  |  | 4 |  |  | $ | 16,789 |  |  | $ | (10) |
Total | 4 |  |  | $ | 16,789 |  |  | $ | (10) |  |  | 4 |  |  | $ | 16,789 |  |  | $ | (10) |

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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 -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-5 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (f) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-5 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 5B -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-5B Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-5 Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (aaa) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-5 Reference 6: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-5 Reference 7: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (e) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-5 Reference 8: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (f)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-5 Reference 9: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (f)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-5 Reference 10: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (f)(3) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-5 Reference 11: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (f)(4) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-5 Reference 12: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 5A -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-5A Reference 13: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 5A -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-5A Reference 14: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 5A -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-5A Reference 15: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 5B -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-5B Reference 16: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 5B -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-5B Reference 17: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 5B -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-5B Reference 18: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 5B -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-5B + Details
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