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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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Fair value portion of investments accounted under the cost method.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 325
-SubTopic 20
-Section 25
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=29638263&loc=d3e39828-111592

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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.

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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

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
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-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

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