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Fair Value Measurements (Tables) | 9 Months Ended
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Sep. 30, 2025
Fair Value Measurements |
Schedule of fair value hierarchy | The carrying values of our assets that are required to be measured at fair value on a recurring basis as of September 30, 2025 and December 31, 2024 approximate fair value because of our ability to immediately convert these instruments into cash with minimal expected change in value which are classified in the table below in one of the three categories of the fair value hierarchy described above (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Fair Value Measurements
​ |  | Level 1 |  | Level 2 |  | Level 3 |  | Total
September 30, 2025 |  | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Assets: |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
Money market mutual fund | ​ | $ | 216,467 | ​ | $ | — | ​ | $ | — | ​ | $ | 216,467
Mutual funds | ​ |  | 99,338 | ​ |  | — | ​ |  | — | ​ |  | 99,338
U.S. Treasury notes | ​ |  | 24,656 | ​ |  | — | ​ |  | — | ​ |  | 24,656
Corporate debt securities | ​ |  | 41,509 | ​ |  | — | ​ |  | — | ​ |  | 41,509
​ | ​ | $ | 381,970 | ​ | $ | — | ​ | $ | — | ​ | $ | 381,970
Liabilities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Convertible Senior Notes | ​ | $ | — | ​ | $ | 184,799 | ​ | $ | — | ​ | $ | 184,799
Contingent consideration | ​ |  | — | ​ |  | — | ​ | ​ | 630 | ​ |  | 630
​ | ​ | $ | — | ​ | $ | 184,799 | ​ | $ | 630 | ​ | $ | 185,429
​ ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Fair Value Measurements
​ |  | Level 1 |  | Level 2 |  | Level 3 |  | Total
December 31, 2024 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Assets: |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
Money market mutual fund | ​ | $ | 134 | ​ | $ | — | ​ | $ | — | ​ | $ | 134
Mutual funds | ​ |  | 97,675 | ​ |  | — | ​ |  | — | ​ |  | 97,675
U.S. Treasury notes | ​ |  | 41,948 | ​ |  | — | ​ |  | — | ​ |  | 41,948
Corporate debt securities | ​ |  | 76,837 | ​ |  | — | ​ |  | — | ​ |  | 76,837
​ | ​ | $ | 216,594 | ​ | $ | — | ​ | $ | — | ​ | $ | 216,594
Liabilities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Convertible Senior Notes | ​ | $ | — | ​ | $ | 198,217 | ​ | $ | — | ​ | $ | 198,217
Contingent consideration | ​ |  | — | ​ |  | — | ​ | ​ | 6,559 | ​ |  | 6,559
​ | ​ | $ | — | ​ | $ | 198,217 | ​ | $ | 6,559 | ​ | $ | 204,776
Schedule of estimated fair values and the carrying values | The following table presents the estimated fair values and the carrying values (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | September 30, 2025 | ​ | December 31, 2024
​ |  | Carrying Value |  | Fair Value |  | Carrying Value |  | Fair Value
2026 Senior Notes | ​ | $ | 184,799 | ​ | $ | 174,478 | ​ | $ | 183,919 | ​ | $ | 164,525
2025 Senior Notes | ​ | $ | — | ​ | $ | — | ​ | $ | 14,298 | ​ | $ | 14,125
Schedule of gains recognized in earnings and the change in net assets related to the contingent consideration | The gains recognized in earnings and the change in net assets related to the contingent consideration at September 30, 2025 were as follows (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Fair Value |  | Gains |  | Reclassification |  | Foreign |  | Fair Value
​ | ​ | December 31, | ​ | recognized in | ​ | to current | ​ | currency | ​ | September 30,
​ | ​ | 2024 | ​ | earnings | ​ | payables | ​ | adjustment | ​ | 2025
2021 Acquisitions | ​ | $ | 909 | ​ | $ | (92) | ​ | $ | (881) | ​ | $ | 64 | ​ | $ | —
2022 Acquisitions | ​ |  | 742 | ​ |  | (207) | ​ |  | — | ​ |  | 95 | ​ |  | 630
2023 Acquisitions | ​ | ​ | 4,908 | ​ | ​ | (4,908) | ​ | ​ | — | ​ | ​ | — | ​ | ​ | —
​ | ​ | $ | 6,559 | ​ | $ | (5,207) | ​ | $ | (881) | ​ | $ | 159 | ​ | $ | 630

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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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- Definition Tabular disclosure of the fair value measurement of liabilities using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes attributable to the following: (1) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets), and gains or losses recognized in other comprehensive income (loss) and a description of where those gains or losses included in earnings (or changes in net assets) are reported in the statement of income (or activities); (2) purchases, sales, issues, and settlements (each type disclosed separately); and (3) transfers in and transfers out of Level 3 (for example, transfers due to changes in the observability of significant inputs) by class of liability. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-3 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
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- Definition Tabular disclosure of information pertaining to carrying amount and estimated fair value of short-term and long-term debt instruments or arrangements, including but not limited to, identification of terms, features, and collateral requirements. + References No definition available. + Details
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