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Investments (Tables) | 9 Months Ended
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Sep. 30, 2023
Investments, Debt and Equity Securities [Abstract] |
Debt Securities, Held-to-maturity | The following table summarizes adjusted cost, gross unrealized losses, and fair value by significant investment category. The Company’s commercial paper investments with original maturities greater than 90 days are classified as held-to-maturity investments on its balance sheets as of September 30, 2023 and December 31, 2022, respectively. The Company’s commercial paper investments with original maturities of 90 days or less are classified as cash equivalents on its balance sheets as of September 30, 2023 and December 31, 2022, respectively.
| Amortized Cost |  | Gross Unrealized |  | Fair Value |  | Net Carrying Value
|  | Gains |  | Losses |  |
As of September 30, 2023 | (In Thousands)
Cash equivalents |  |  |  |  |  |  |  |  |
Commercial paper | $ | 2,964 |  |  | $ | 2 |  |  | $ | — |  |  | $ | 2,966 |  |  | $ | 2,964 |
Total cash equivalents | $ | 2,964 |  |  | $ | 2 |  |  | $ | — |  |  | $ | 2,966 |  |  | $ | 2,964 |
Investments |  |  |  |  |  |  |  |  |
Commercial paper | $ | 20,732 |  |  | $ | — |  |  | $ | (16) |  |  | $ | 20,716 |  |  | $ | 20,732 |
Total investments | $ | 20,732 |  |  | $ | — |  |  | $ | (16) |  |  | $ | 20,716 |  |  | $ | 20,732 |
| Amortized Cost |  | Gross Unrealized |  | Fair Value |  | Net Carrying Value
|  | Gains |  | Losses |  |
As of December 31, 2022 | (In Thousands)
Investments |  |  |  |  |  |  |  |  |
Commercial Paper | $ | 58,733 |  |  | $ | — |  |  | $ | (144) |  |  | $ | 58,589 |  |  | $ | 58,733 |
Total investments | $ | 58,733 |  |  | $ | — |  |  | $ | (144) |  |  | $ | 58,589 |  |  | $ | 58,733 |
The amortized cost and fair value of held-to-maturity securities as of September 30, 2023 and December 31, 2022, by contractual maturity, are shown below.
As of September 30, 2023 | Amortized Cost |  | Fair Value
| (In Thousands)
Within one year | $ | 20,732 |  |  | $ | 20,716 |
After one year through five years | — |  |  | — |
After 5 years through 10 years | — |  |  | — |
After 10 years | — |  |  | — |
Total investments | $ | 20,732 |  |  | $ | 20,716 |
As of December 31, 2022 | Amortized Cost |  | Fair Value
| (In Thousands)
Within one year | $ | 58,733 |  |  | $ | 58,589 |
After one year through five years | — |  |  | — |
After 5 years through 10 years | — |  |  | — |
After 10 years | — |  |  | — |
Total investments | $ | 58,733 |  |  | $ | 58,589 |
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 September 30, 2023 | (Dollars In Thousands)
Investments |  |  |  |  |  |  |  |  |  |  |
Commercial paper | 4 |  |  | $ | 20,716 |  |  | $ | (16) |  |  | 4 |  |  | $ | 20,716 |  |  | $ | (16) |
Total | 4 |  |  | $ | 20,716 |  |  | $ | (16) |  |  | 4 |  |  | $ | 20,716 |  |  | $ | (16) |
| Less than 12 Months |  | Total
| # of Securities |  | Fair Value |  | Unrealized Losses |  | # of Securities |  | Fair Value |  | Unrealized Losses
As of December 31, 2022 | (Dollars In Thousands)
Investments |  |  |  |  |  |  |  |  |  |  |
Commercial paper | 11 |  |  | $ | 58,589 |  |  | $ | (144) |  |  | 11 |  |  | $ | 58,589 |  |  | $ | (144) |
Total | 11 |  |  | $ | 58,589 |  |  | $ | (144) |  |  | 11 |  |  | $ | 58,589 |  |  | $ | (144) |

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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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