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Financial Instruments (Tables) | 12 Months Ended
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Dec. 31, 2021
Fair Value Disclosures [Abstract] |
Summary of Investments | Investments consist of the following as of December 31, 2021 and 2020 (dollars in thousands):
|  | 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 |
|  | December 31, 2020 |
|  |  |  |  |  | Gross Unrealized |  |  |  |  |
|  | Cost |  |  | Gain |  |  | (Loss) |  |  | Fair Value |
Short-term investments (available for sale): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Municipal bonds |  | $ | 139 |  |  | $ | 1 |  |  | $ | - |  |  | $ | 140 |
Non-governmental debt securities |  |  | 288,578 |  |  |  | 331 |  |  |  | (176 | ) |  |  | 288,733 |
Treasury and federal agencies |  |  | 11,799 |  |  |  | 6 |  |  |  | (2 | ) |  |  | 11,803 |
Total short-term investments (available for sale) |  | $ | 300,516 |  |  | $ | 338 |  |  | $ | (178 | ) |  | $ | 300,676 |
Schedule of Available-for-Sale Investments | A schedule of available-for-sale investments segregated by their original stated terms to maturity as of December 31, 2021 and 2020 are as follows (dollars in thousands):
|  | Less than one year |  |  | One to five years |  |  | Six to ten years |  |  | Greater than ten years |  |  | Total |
Original stated term to maturity of available-for-sale- investments as of December 31, 2021 |  | $ | 133,728 |  |  | $ | 40,485 |  |  | $ | - |  |  | $ | - |  |  | $ | 174,213 |
Original stated term to maturity of available-for-sale- investments as of December 31, 2020 |  | $ | 182,959 |  |  | $ | 117,641 |  |  | $ | - |  |  | $ | 76 |  |  | $ | 300,676 |
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 for the years ended December 31, 2021, 2020 and 2019 were as follows (dollars in thousands):
For the year ended December 31, 2021 |  | $ | 1,726 |
For the year ended December 31, 2020 |  | $ | 1,596 |
For the year ended December 31, 2019 |  | $ | 1,418 |

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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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