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Fair Value Measurements (Tables) | 6 Months Ended
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Jun. 30, 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 June 30, 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
June 30, 2021 |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
Cash equivalents: |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
Money market mutual fund | ​ | $ | 30,748 | ​ | $ | — | ​ | $ | — | ​ | $ | 30,748
Marketable equity securities: | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
Mutual funds | ​ |  | 59,925 | ​ |  | — | ​ |  | — | ​ |  | 59,925
Available-for-sale debt securities: | ​ |  | ​ | ​ |  |  | ​ |  |  | ​ |  | ​
U.S. Treasury notes | ​ |  | 229,131 | ​ |  | — | ​ |  | — | ​ |  | 229,131
​ | ​ | $ | 319,804 | ​ | $ | — | ​ | $ | — | ​ | $ | 319,804
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 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
​

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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=117815213&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=117815213&loc=d3e19207-110258 + Details
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