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Fair Value Measurements (Tables) | 12 Months Ended
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Dec. 31, 2021
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, 2021 and 2020 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, 2021 |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
Cash equivalents: |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
Money market mutual fund | ​ | $ | 111,313 | ​ | $ | — | ​ | $ | — | ​ | $ | 111,313
Marketable equity securities: | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
Mutual funds | ​ |  | 110,006 | ​ |  | — | ​ |  | — | ​ |  | 110,006
Available-for-sale debt securities: | ​ |  | ​ | ​ |  |  | ​ |  |  | ​ |  | ​
U.S. Treasury notes | ​ |  | 223,896 | ​ |  | — | ​ |  | — | ​ |  | 223,896
Corporate debt securities | ​ | ​ | 155,796 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 155,796
​ | ​ | $ | 601,011 | ​ | $ | — | ​ | $ | — | ​ | $ | 601,011
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Fair Value Measurements
​ |  | Level 1 |  | Level 2 |  | Level 3 |  | Total
December 31, 2020 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Cash equivalents: |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
Money market mutual fund | ​ | $ | 11,820 | ​ | $ | — | ​ | $ | — | ​ | $ | 11,820
Marketable equity securities: | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
Mutual funds | ​ |  | 33,135 | ​ |  | — | ​ |  | — | ​ |  | 33,135
Available-for-sale debt securities: | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
U.S. Treasury notes | ​ |  | 23,309 | ​ |  | — | ​ |  | — | ​ |  | 23,309
​ | ​ | $ | 68,264 | ​ | $ | — | ​ | $ | — | ​ | $ | 68,264
Schedule of estimated fair values and the carrying values | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | December 31, 2021 | ​ | December 31, 2020
​ |  | Carrying Value |  | Fair Value |  | Carrying Value |  | Fair Value
2026 Senior Notes | ​ | $ | 390,523 | ​ | $ | 331,783 | ​ | $ | — | ​ | $ | —
2025 Senior Notes | ​ | $ | 13,648 | ​ | $ | 13,628 | ​ | $ | 111,344 | ​ | $ | 108,210

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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 -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258 + 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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