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v3.24.3

Note 4 - Investments and Fair-Value Measurements (Tables) | 9 Months Ended
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Sep. 30, 2024
Notes Tables |
Debt Securities, Available-for-Sale [Table Text Block] |
​ |  | September 30, 2024 |
​ |  |  |  |  |  | Gross Unrealized |  |  |  |  |
|  | Amortized Cost |  |  | Gains/(Losses) |  |  | Estimated Fair Value |
​ |  | (In thousands) |
​ |  | ​ |  |  | ​ |  |  | ​ |
U.S. government securities classified as short-term investments |  | $ | 19,924 |  |  | $ | 4 |  |  | $ | 19,928 |
Money-market funds classified as short-term investments |  |  | 101,712 |  |  |  | — |  |  |  | 101,712 |
Total short-term investments |  |  | 121,636 |  |  |  | 4 |  |  |  | 121,640 |
Certificate of deposit classified as non-current restricted investments |  |  | 1,054 |  |  |  | — |  |  |  | 1,054 |
Total investments |  | $ | 122,690 |  |  | $ | 4 |  |  | $ | 122,694 |
​ |  | December 31, 2023 |
​ |  |  |  |  |  | Gross Unrealized |  |  |  |  |
|  | Amortized Cost |  |  | Gains/(Losses) |  |  | Estimated Fair Value |
​ |  | (In thousands) |
​ |  | ​ |  |  | ​ |  |  | ​ |
U.S. government securities classified as short-term investments |  | $ | 102,100 |  |  | $ | 19 |  |  | $ | 102,119 |
Money-market funds classified as short-term investments |  |  | 62,643 |  |  |  | — |  |  |  | 62,643 |
Total short-term investments |  |  | 164,743 |  |  |  | 19 |  |  |  | 164,762 |
Certificate of deposit classified as non-current restricted investments |  |  | 1,054 |  |  |  | — |  |  |  | 1,054 |
Total investments |  | $ | 165,797 |  |  | $ | 19 |  |  | $ | 165,816 |
Fair Value, Assets Measured on Recurring Basis [Table Text Block] |
​ |  | September 30, 2024 |
​ |  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Total |
​ |  | (In thousands) |
Assets: |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
U.S. government securities classified as short-term investments |  | $ | — |  |  | $ | 19,928 |  |  | $ | — |  |  | $ | 19,928 |
Money-market funds classified as short-term investments |  |  | 101,712 |  |  |  | — |  |  |  | — |  |  |  | 101,712 |
Total short-term investments |  |  | 101,712 |  |  |  | 19,928 |  |  |  | — |  |  |  | 121,640 |
Certificate of deposit classified as non-current restricted investments |  |  | 1,054 |  |  |  | — |  |  |  | — |  |  |  | 1,054 |
Total investments |  | $ | 102,766 |  |  | $ | 19,928 |  |  | $ | — |  |  | $ | 122,694 |
​ |  | December 31, 2023 |
​ |  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Total |
​ |  | (In thousands) |
Assets: |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
U.S. government securities classified as short-term investments |  | $ | — |  |  | $ | 102,119 |  |  | $ | — |  |  | $ | 102,119 |
Money-market funds classified as short-term investments |  |  | 62,643 |  |  |  | — |  |  |  | — |  |  |  | 62,643 |
Total short-term investments |  |  | 62,643 |  |  |  | 102,119 |  |  |  | — |  |  |  | 164,762 |
Certificate of deposit classified as non-current restricted investments |  |  | 1,054 |  |  |  | — |  |  |  | — |  |  |  | 1,054 |
Total investments |  | $ | 63,697 |  |  | $ | 102,119 |  |  | $ | — |  |  | $ | 165,816 |

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- Definition Tabular disclosure of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 9 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-9 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-3 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-2 Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-2 Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-2 Reference 6: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (aa) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-2 Reference 7: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (aaa) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-2 Reference 8: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-2 Reference 9: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-3 Reference 10: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-3 Reference 11: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-3 Reference 12: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-3 + Details
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- Definition Tabular disclosure of assets, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, by class that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
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