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Fair Value Measurements - Estimated Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands | Sep. 30, 2015 | Dec. 31, 2014
--- | --- | ---
Investment securities: |  |
Investment securities, restricted, long-term | $ 336 | $ 336
Carrying Value |  |
Investment securities: |  |
Investment securities, restricted, long-term | 336 | 336
Cost method investment | 2,776 | 2,776
Notes Payable: |  |
Current portion of notes payable, related party | 1,668 | 1,479
Long-term portion of notes payable, related party | 14,022 | 14,431
Highview technology license payable | 0 | 155
Highview technology license payable, long-term | 1,334 | 1,389
Stock appreciation rights, liability-classified equity award | 536 | 0
Fair Value |  |
Investment securities: |  |
Investment securities, restricted, long-term | 336 | 336
Cost method investment | 2,776 | 2,776
Notes Payable: |  |
Current portion of notes payable, related party | 1,514 | 1,439
Long-term portion of notes payable, related party | 14,113 | 14,356
Highview technology license payable | 0 | 155
Highview technology license payable, long-term | 1,334 | 1,389
Stock appreciation rights, liability-classified equity award | $ 536 | $ 0

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- Definition Total debt and equity financial instruments including: (1) securities held-to-maturity, (2) trading securities, and (3) securities available-for-sale which are intended to be held for greater than one year or the normal operating cycle, whichever is longer and that are pledged to one or more secured parties who have the right to buy, sell, or re-pledge the collateral. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(b)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.12) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 6 -Article 9 + Details
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