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Financial Instruments (Tables) | 6 Months Ended
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Jun. 30, 2020
Fair Value Disclosures [Abstract] |
Summary of Investments | Investments consist of the following as of June 30, 2020 and December 31, 2019 (dollars in thousands):
|  | June 30, 2020 |
|  |  |  |  |  | Gross Unrealized |  |  |  |  |
|  | Cost |  |  | Gain |  |  | (Loss) |  |  | Fair Value |
Short-term investments (available for sale): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Municipal bonds |  | $ | 1,538 |  |  | $ | 2 |  |  | $ | - |  |  | $ | 1,540 |
Non-governmental debt securities |  |  | 219,215 |  |  |  | 975 |  |  |  | (37 | ) |  |  | 220,153 |
Treasury and federal agencies |  |  | 28,525 |  |  |  | 49 |  |  |  | (2 | ) |  |  | 28,572 |
Total short-term investments (available for sale) |  | $ | 249,278 |  |  | $ | 1,026 |  |  | $ | (39 | ) |  | $ | 250,265 |
|  | December 31, 2019 |
|  |  |  |  |  | Gross Unrealized |  |  |  |  |
|  | Cost |  |  | Gain |  |  | (Loss) |  |  | Fair Value |
Short-term investments (available for sale): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Municipal bonds |  | $ | 1,361 |  |  | $ | 3 |  |  | $ | - |  |  | $ | 1,364 |
Non-governmental debt securities |  |  | 165,423 |  |  |  | 433 |  |  |  | (37 | ) |  |  | 165,819 |
Treasury and federal agencies |  |  | 18,307 |  |  |  | 7 |  |  |  | (9 | ) |  |  | 18,305 |
Total short-term investments (available for sale) |  | $ | 185,091 |  |  | $ | 443 |  |  | $ | (46 | ) |  | $ | 185,488 |
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 and years to date ended June 30, 2020 and 2019 were as follows (dollars in thousands):
| Maintenance Fee Payments |
For the quarter ended June 30, 2020 (1) | $ | - |
For the quarter ended June 30, 2019 | $ | 359 |
For the year to date ended June 30, 2020 (1) | $ | 1,443 |
For the year to date ended June 30, 2019 | $ | 707 |
________________________ (1)During the first quarter of 2020, the Company prepaid approximately $1.4 million of maintenance payments, of which approximately $0.4 million and $0.8 million was recognized as expense for the quarter and year to date ended June 30, 2020, respectively.

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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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