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Financial Instruments (Tables) | 6 Months Ended
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Jun. 30, 2022
Fair Value Disclosures [Abstract] |
Summary of Investments | Investments consist of the following as of June 30, 2022 and December 31, 2021 (dollars in thousands):
|  | June 30, 2022 |
|  |  |  |  |  | Gross Unrealized |  |  |  |  |
|  | Cost |  |  | Gain |  |  | (Loss) |  |  | Fair Value |
Short-term investments (available for sale): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Municipal bonds |  | $ | 3,037 |  |  | $ | - |  |  | $ | (1 | ) |  | $ | 3,036 |
Non-governmental debt securities |  |  | 225,682 |  |  |  | 3 |  |  |  | (2,032 | ) |  |  | 223,653 |
Treasury and federal agencies |  |  | 141,106 |  |  |  | 2 |  |  |  | (957 | ) |  |  | 140,151 |
Total short-term investments (available for sale) |  | $ | 369,825 |  |  | $ | 5 |  |  | $ | (2,990 | ) |  | $ | 366,840 |
|  | December 31, 2021 |
|  |  |  |  |  | Gross Unrealized |  |  |  |  |
|  | Cost |  |  | Gain |  |  | (Loss) |  |  | Fair Value |
Short-term investments (available for sale): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Municipal bonds |  | $ | 5,028 |  |  | $ | - |  |  | $ | (1 | ) |  | $ | 5,027 |
Non-governmental debt securities |  |  | 168,623 |  |  |  | 27 |  |  |  | (184 | ) |  |  | 168,466 |
Treasury and federal agencies |  |  | 720 |  |  |  | - |  |  |  | - |  |  |  | 720 |
Total short-term investments (available for sale) |  | $ | 174,371 |  |  | $ | 27 |  |  | $ | (185 | ) |  | $ | 174,213 |
Schedule of Maintenance Fee Payment to CCKF | We make periodic operating maintenance payments to CCKF related to proprietary rights that we use in our intellipath® personalized learning technology. The total fees recorded during the quarters and years to date ended June 30, 2022 and 2021 were as follows (dollars in thousands):
| Maintenance Fee Payments |
For the quarter ended June 30, 2022 | $ | 394 |
For the quarter ended June 30, 2021 | $ | 436 |
For the year to date ended June 30, 2022 | $ | 827 |
For the year to date ended June 30, 2021 | $ | 859 |

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- Definition Tabular disclosure of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -URI https://asc.fasb.org/topic&trid=2196928 + Details
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- Definition Tabular disclosure of related party transactions. Examples of related party transactions include, but are not limited to, transactions between (a) a parent company and its subsidiary; (b) subsidiaries of a common parent; (c) and entity and its principal owners and (d) affiliates. + References No definition available. + Details
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