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Financial Instruments (Tables) | 12 Months Ended
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Dec. 31, 2017
Fair Value Disclosures [Abstract] |
Summary of Investments | Investments consist of the following as of December 31, 2017 and 2016 (dollars in thousands):
|  | December 31, 2017 |
|  |  |  |  |  | Gross Unrealized |  |  |  |  |
|  | Cost |  |  | Gain |  |  | (Loss) |  |  | Fair Value |
Short-term investments (available for sale): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Municipal bonds |  | $ | 830 |  |  | $ | - |  |  | $ | - |  |  | $ | 830 |
Non-governmental debt securities |  |  | 125,485 |  |  |  | 7 |  |  |  | (222 | ) |  |  | 125,270 |
Treasury and federal agencies |  |  | 30,211 |  |  |  | - |  |  |  | (133 | ) |  |  | 30,078 |
Total short-term investments |  |  | 156,526 |  |  |  | 7 |  |  |  | (355 | ) |  |  | 156,178 |
Restricted short-term investments (available for sale): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Non-governmental debt securities |  |  | 5,070 |  |  |  | - |  |  |  | - |  |  |  | 5,070 |
Total investments (available for sale) |  | $ | 161,596 |  |  | $ | 7 |  |  | $ | (355 | ) |  | $ | 161,248 |
|  | December 31, 2016 |
|  |  |  |  |  | Gross Unrealized |  |  |  |  |
|  | Cost |  |  | Gain |  |  | (Loss) |  |  | Fair Value |
Short-term investments (available for sale): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Municipal bonds |  | $ | 4,050 |  |  | $ | - |  |  | $ | - |  |  | $ | 4,050 |
Non-governmental debt securities |  |  | 107,305 |  |  |  | 22 |  |  |  | (113 | ) |  |  | 107,214 |
Treasury and federal agencies |  |  | 36,480 |  |  |  | 10 |  |  |  | (73 | ) |  |  | 36,417 |
Total short-term investments |  |  | 147,835 |  |  |  | 32 |  |  |  | (186 | ) |  |  | 147,681 |
Restricted short-term investments (available for sale): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Non-governmental debt securities |  |  | 8,597 |  |  |  | - |  |  |  | - |  |  |  | 8,597 |
Total investments (available for sale) |  | $ | 156,432 |  |  | $ | 32 |  |  | $ | (186 | ) |  | $ | 156,278 |
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, 2017 and 2016 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, 2017 |  | $ | 113,634 |  |  | $ | 46,586 |  |  | $ | - |  |  | $ | 1,028 |  |  | $ | 161,248 |
Original stated term to maturity of available-for-sale- investments as of December 31, 2016 |  | $ | 113,040 |  |  | $ | 39,459 |  |  | $ | 800 |  |  | $ | 2,979 |  |  | $ | 156,278 |
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 December 31, 2017 and 2016 were as follows (dollars in thousands):
|  | As of December 31, 2017 |
|  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Total |
Municipal bonds |  | $ | - |  |  | $ | 830 |  |  | $ | - |  |  | $ | 830 |
Non-governmental debt securities |  |  | 31,500 |  |  |  | 98,840 |  |  |  | - |  |  |  | 130,340 |
Treasury and federal agencies |  |  | - |  |  |  | 30,078 |  |  |  | - |  |  |  | 30,078 |
Totals |  | $ | 31,500 |  |  | $ | 129,748 |  |  | $ | - |  |  | $ | 161,248 |
|  | As of December 31, 2016 |
|  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Total |
Municipal bonds |  | $ | - |  |  | $ | 4,050 |  |  | $ | - |  |  | $ | 4,050 |
Non-governmental debt securities |  |  | 33,597 |  |  |  | 82,214 |  |  |  | - |  |  |  | 115,811 |
Treasury and federal agencies |  |  | - |  |  |  | 36,417 |  |  |  | - |  |  |  | 36,417 |
Totals |  | $ | 33,597 |  |  | $ | 122,681 |  |  | $ | - |  |  | $ | 156,278 |
Schedule of Maintenance Fee Payment to CCKF | We make periodic operating maintenance payments related to proprietary rights that we use in our intellipathTM personalized learning technology. The total fees paid to CCKF for the years ended December 31, 2017, 2016 and 2015 were as follows (dollars in thousands):
|  | Maintenance Fee Payments |
For the year ended December 31, 2017 |  | $ | 1,371 |
For the year ended December 31, 2016 |  | $ | 1,375 |
For the year ended December 31, 2015 |  | $ | 1,390 |

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- Definition Tabular disclosure of available-for-sale securities which includes, but is not limited to, changes in the cost basis and fair value, fair value and gross unrealized gain (loss), fair values by type of security, contractual maturity and classification, amortized cost basis, contracts to acquire securities to be accounted for as available-for-sale, debt maturities, transfers to trading, change in net unrealized holding gain (loss) net of tax, continuous unrealized loss position fair value, aggregate losses qualitative disclosures, other than temporary impairment (OTTI) losses or other disclosures related to available for sale securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=75019621&loc=d3e62557-112803 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27337-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27198-111563 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=75019621&loc=d3e62586-112803 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27357-111563 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563 + 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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19190-110258 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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- Definition Tabular disclosure of maturities of an entity's investments as well as any other information pertinent to the investments. + References No definition available. + 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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