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Financial Instruments (Tables) | 3 Months Ended
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Mar. 31, 2022
Fair Value Disclosures [Abstract] |
Summary of Investments | Investments consist of the following as of March 31, 2022 and December 31, 2021 (dollars in thousands):
|  | March 31, 2022 |
|  |  |  |  |  | Gross Unrealized |  |  |  |  |
|  | Cost |  |  | Gain |  |  | (Loss) |  |  | Fair Value |
Short-term investments (available for sale): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Municipal bonds |  | $ | 5,000 |  |  | $ | - |  |  | $ | - |  |  | $ | 5,000 |
Non-governmental debt securities |  |  | 208,401 |  |  |  | 3 |  |  |  | (1,192 | ) |  |  | 207,212 |
Treasury and federal agencies |  |  | 95,737 |  |  |  | - |  |  |  | (329 | ) |  |  | 95,408 |
Total short-term investments (available for sale) |  | $ | 309,138 |  |  | $ | 3 |  |  | $ | (1,521 | ) |  | $ | 307,620 |
|  | 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 ended March 31, 2022 and 2021 were as follows (dollars in thousands):
| Maintenance Fee Payments |
For the quarter ended March 31, 2022 | $ | 433 |
For the quarter ended March 31, 2021 | $ | 423 |

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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 http://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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