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Financial Instruments (Tables) | 3 Months Ended
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Mar. 31, 2021
Fair Value Disclosures [Abstract] |
Summary of Investments | Investments consist of the following as of March 31, 2021 and December 31, 2020 (dollars in thousands):
|  | March 31, 2021 |
|  |  |  |  |  | Gross Unrealized |  |  |  |  |
|  | Cost |  |  | Gain |  |  | (Loss) |  |  | Fair Value |
Short-term investments (available for sale): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Municipal bonds |  | $ | 139 |  |  | $ | 1 |  |  | $ | - |  |  | $ | 140 |
Non-governmental debt securities |  |  | 354,136 |  |  |  | 145 |  |  |  | (208 | ) |  |  | 354,073 |
Treasury and federal agencies |  |  | 6,770 |  |  |  | 5 |  |  |  | (2 | ) |  |  | 6,773 |
Total short-term investments (available for sale) |  | $ | 361,045 |  |  | $ | 151 |  |  | $ | (210 | ) |  | $ | 360,986 |
|  | 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 Maintenance Fee Payment to CCKF | We make periodic operating maintenance payments related to proprietary rights that we use in our intellipath® personalized learning technology. The total fees paid during the quarters ended March 31, 2021 and 2020 were as follows (dollars in thousands):
| Maintenance Fee Payments |
For the quarter ended March 31, 2021 | $ | 423 |
For the quarter ended March 31, 2020 (1) | $ | 1,443 |
________________________ (1)During the first quarter of 2020, the Company prepaid maintenance payments for the full year 2020, of which approximately $0.4 million was recognized as expense for the quarter ended March 31, 2020.

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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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