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Investments and Fair Value Measurements - Investment Category and Length (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Summary of fair value and gross unrealized losses related to available-for-sale securities [Abstract] |  |  |
Fair value, in loss position less than twelve months | $ 11,375,000 | $ 8,262,000 |
Gross unrealized loss, in loss position less than twelve months | (67,000) | (40,000) |
Fair value, in loss position greater than twelve months | 5,390,000 | 4,309,000 |
Gross unrealized loss, in loss position greater than twelve months | (9,000) | (2,000) |
Fair value, total in loss position | 16,765,000 | 12,571,000 |
Gross unrealized loss, total in loss position | (76,000) | (42,000) |
Certificates of Deposit [Member] |  |  |
Summary of fair value and gross unrealized losses related to available-for-sale securities [Abstract] |  |  |
Fair value, in loss position less than twelve months | 4,509,000 | 4,492,000 |
Gross unrealized loss, in loss position less than twelve months | (11,000) | (13,000) |
Fair value, in loss position greater than twelve months | 3,543,000 |  |
Gross unrealized loss, in loss position greater than twelve months | (2,000) |  |
Fair value, total in loss position | 8,052,000 | 4,492,000 |
Gross unrealized loss, total in loss position | (13,000) | (13,000) |
Corporate Bonds [Member] |  |  |
Summary of fair value and gross unrealized losses related to available-for-sale securities [Abstract] |  |  |
Fair value, in loss position less than twelve months | 6,866,000 | 3,770,000 |
Gross unrealized loss, in loss position less than twelve months | (56,000) | (27,000) |
Fair value, in loss position greater than twelve months | 1,847,000 | 4,309,000 |
Gross unrealized loss, in loss position greater than twelve months | (7,000) | (2,000) |
Fair value, total in loss position | 8,713,000 | 8,079,000 |
Gross unrealized loss, total in loss position | (63,000) | (29,000) |
Other Assets [Member] |  |  |
Minority Investments [Abstract] |  |  |
Investments in privately-held companies | 12,100,000 | 12,100,000 |
Minority investments in unconsolidated privately-held companies | $ 0 | $ 200,000 | $ 200,000

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- Definition Amount of unrealized loss on securities classified as available-for-sale that have been in a loss position for twelve months or longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 + Details
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- Definition Amount of unrealized loss on securities classified as available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 + Details
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