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Financial Instruments (Tables) | 3 Months Ended
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Mar. 31, 2019
Fair Value Disclosures [Abstract] |
Summary of Investments | Investments consist of the following as of March 31, 2019 and December 31, 2018 (dollars in thousands):
|  | March 31, 2019 |
|  |  |  |  |  | Gross Unrealized |  |  |  |  |
|  | Cost |  |  | Gain |  |  | (Loss) |  |  | Fair Value |
Short-term investments (available for sale): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Non-governmental debt securities |  | $ | 187,935 |  |  | $ | 150 |  |  | $ | (95 | ) |  | $ | 187,990 |
Treasury and federal agencies |  |  | 12,816 |  |  |  | 4 |  |  |  | (42 | ) |  |  | 12,778 |
Total short-term investments (available for sale) |  | $ | 200,751 |  |  | $ | 154 |  |  | $ | (137 | ) |  | $ | 200,768 |
|  | December 31, 2018 |
|  |  |  |  |  | Gross Unrealized |  |  |  |  |
|  | Cost |  |  | Gain |  |  | (Loss) |  |  | Fair Value |
Short-term investments (available for sale): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Non-governmental debt securities |  | $ | 179,393 |  |  | $ | 35 |  |  | $ | (337 | ) |  | $ | 179,091 |
Treasury and federal agencies |  |  | 17,417 |  |  |  | 5 |  |  |  | (85 | ) |  |  | 17,337 |
Total short-term investments (available for sale) |  | $ | 196,810 |  |  | $ | 40 |  |  | $ | (422 | ) |  | $ | 196,428 |
Investments Measured at Fair Value on Recurring Basis | Investments measured at fair value on a recurring basis subject to the disclosure requirements of FASB ASC Topic 820 – Fair Value Measurements at March 31, 2019 and December 31, 2018 were as follows (dollars in thousands):
|  | As of March 31, 2019 |
|  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Total |
Non-governmental debt securities |  | $ | 10,000 |  |  | $ | 177,990 |  |  | $ | - |  |  | $ | 187,990 |
Treasury and federal agencies |  |  | - |  |  |  | 12,778 |  |  |  | - |  |  |  | 12,778 |
Totals |  | $ | 10,000 |  |  | $ | 190,768 |  |  | $ | - |  |  | $ | 200,768 |
|  | As of December 31, 2018 |
|  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Total |
Non-governmental debt securities |  | $ | 20,000 |  |  | $ | 159,091 |  |  | $ | - |  |  | $ | 179,091 |
Treasury and federal agencies |  |  | - |  |  |  | 17,337 |  |  |  | - |  |  |  | 17,337 |
Totals |  | $ | 20,000 |  |  | $ | 176,428 |  |  | $ | - |  |  | $ | 196,428 |
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 to CCKF for the quarters ended March 31, 2019 and 2018 were as follows (dollars in thousands):
| Maintenance Fee Payments |
For the quarter ended March 31, 2019 | $ | 348 |
For the quarter ended March 31, 2018 | $ | 376 |

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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 assets, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, by class that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19190-110258 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + 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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