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Fair Value Measurements (Tables) | 3 Months Ended
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Mar. 31, 2025
Fair Value Measurements |
Schedule of financial assets and liabilities subject to fair value measurements | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | As of | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | March 31, 2025 |  | Level 1 |  | Level 2 |  | Level 3
​ | ​ | (In thousands)
Assets: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Money market funds and cash equivalents | ​ | $ | 8,939 | ​ | ​ | — | ​ | $ | 8,939 | ​ | ​ | —
Marketable securities | ​ | ​ | 656,155 | ​ | ​ | — | ​ | ​ | 656,155 | ​ | ​ | —
​ | ​ | $ | 665,094 | ​ | ​ | — | ​ | $ | 665,094 | ​ | ​ | —
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | As of | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | December 31, 2024 |  | Level 1 |  | Level 2 |  | Level 3
​ | ​ | (In thousands)
Assets: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Money market funds and cash equivalents | ​ | $ | 9,927 | ​ | ​ | — | ​ | $ | 9,927 | ​ | ​ | —
Marketable securities | ​ | ​ | 696,925 | ​ | ​ | — | ​ | ​ | 696,925 | ​ | ​ | —
​ | ​ | $ | 706,852 | ​ | ​ | — | ​ | $ | 706,852 | ​ | ​ | —

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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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