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Fair Value Measurements (Tables) | 12 Months Ended
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Dec. 31, 2023
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 December 31, 2023 and 2022 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
December 31, 2023 |  | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Assets: |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
Money market mutual fund | ​ | $ | 5,367 | ​ | $ | — | ​ | $ | — | ​ | $ | 5,367
Mutual funds | ​ |  | 101,085 | ​ |  | — | ​ |  | — | ​ |  | 101,085
U.S. Treasury notes | ​ |  | 136,665 | ​ |  | — | ​ |  | — | ​ |  | 136,665
Corporate debt securities | ​ |  | 172,658 | ​ |  | — | ​ |  | — | ​ |  | 172,658
​ | ​ | $ | 415,775 | ​ | $ | — | ​ | $ | — | ​ | $ | 415,775
Liabilities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Convertible Senior Notes | ​ | $ | — | ​ | $ | 378,553 | ​ | $ | — | ​ | $ | 378,553
Contingent consideration | ​ |  | — | ​ |  | — | ​ | ​ | 9,589 | ​ |  | 9,589
​ | ​ | $ | — | ​ | $ | 378,553 | ​ | $ | 9,589 | ​ | $ | 388,142
​ ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Fair Value Measurements
​ |  | Level 1 |  | Level 2 |  | Level 3 |  | Total
December 31, 2022 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Assets: |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
Money market mutual fund | ​ | $ | 1,843 | ​ | $ | — | ​ | $ | — | ​ | $ | 1,843
Mutual funds | ​ |  | 99,777 | ​ |  | — | ​ |  | — | ​ |  | 99,777
U.S. Treasury notes | ​ |  | 190,718 | ​ |  | — | ​ |  | — | ​ |  | 190,718
Corporate debt securities | ​ |  | 196,233 | ​ |  | — | ​ |  | — | ​ |  | 196,233
​ | ​ | $ | 488,571 | ​ | $ | — | ​ | $ | — | ​ | $ | 488,571
Liabilities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Convertible Senior Notes | ​ | $ | — | ​ | $ | 406,708 | ​ | $ | — | ​ | $ | 406,708
Contingent consideration | ​ |  | — | ​ |  | — | ​ | ​ | 4,677 | ​ |  | 4,677
​ | ​ | $ | — | ​ | $ | 406,708 | ​ | $ | 4,677 | ​ | $ | 411,385
Schedule of estimated fair values and the carrying values | The following table presents the estimated fair values and the carrying values (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | December 31, 2023 | ​ | December 31, 2022
​ |  | Carrying Value |  | Fair Value |  | Carrying Value |  | Fair Value
2026 Senior Notes | ​ | $ | 364,362 | ​ | $ | 306,355 | ​ | $ | 392,621 | ​ | $ | 290,132
2025 Senior Notes | ​ | $ | 14,191 | ​ | $ | 13,495 | ​ | $ | 14,087 | ​ | $ | 12,373
Schedule of (gains)/losses recognized in earnings and the change in net assets related to the contingent consideration | The (gains) losses recognized in earnings and the change in net assets related to the contingent consideration at December 31, 2023 were as follows (in thousands):
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Fair Value | ​ | ​ | ​ |  | (Gains)/losses |  | ​ | ​ |  | Foreign |  | Fair Value
​ | ​ | December 31, | ​ | ​ | ​ | ​ | recognized in | ​ | ​ | ​ | ​ | Currency | ​ | December 31,
​ | ​ | 2022 | ​ | Additions | ​ | earnings | ​ | Payments | ​ | Adjustment | ​ | 2023
2021 Acquisitions | ​ | $ | 902 | ​ | $ | — | ​ | $ | 96 | ​ | $ | — | ​ | $ | 8 | ​ | $ | 1,006
2022 Acquisitions | ​ |  | 3,775 | ​ |  | — | ​ |  | (1,015) | ​ |  | (276) | ​ |  | 112 | ​ |  | 2,596
2023 Acquisitions | ​ | ​ | — | ​ |  | 5,683 | ​ | ​ | 304 | ​ |  | — | ​ |  | — | ​ |  | 5,987
​ | ​ | $ | 4,677 | ​ | $ | 5,683 | ​ | $ | (615) | ​ | $ | (276) | ​ | $ | 120 | ​ | $ | 9,589

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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://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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 + 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://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c) -SubTopic 10 -Topic 820 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-3 + 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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