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Investments and Fair Value Measurements - Investment Category and Length (Details) - USD ($) | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2016 | Dec. 31, 2015
Summary of fair value and gross unrealized losses related to available-for-sale securities [Abstract] |  |
Fair value, in loss position less than twelve months | $ 3,805,000 | $ 11,375,000
Gross unrealized loss, in loss position less than twelve months | (6,000) | (67,000)
Fair value, in loss position greater than twelve months | 5,912,000 | 5,390,000
Gross unrealized loss, in loss position greater than twelve months | (13,000) | (9,000)
Fair value, total in loss position | 9,717,000 | 16,765,000
Gross unrealized loss, total in loss position | (19,000) | (76,000)
Minority Investments [Abstract] |  |
Minority investments in unconsolidated privately-held companies | 3 |
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 | 2,104,000 | 4,509,000
Gross unrealized loss, in loss position less than twelve months | (5,000) | (11,000)
Fair value, in loss position greater than twelve months | 2,399,000 | 3,543,000
Gross unrealized loss, in loss position greater than twelve months | (1,000) | (2,000)
Fair value, total in loss position | 4,503,000 | 8,052,000
Gross unrealized loss, total in loss position | (6,000) | (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 | 1,701,000 | 6,866,000
Gross unrealized loss, in loss position less than twelve months | (1,000) | (56,000)
Fair value, in loss position greater than twelve months | 3,513,000 | 1,847,000
Gross unrealized loss, in loss position greater than twelve months | (12,000) | (7,000)
Fair value, total in loss position | 5,214,000 | 8,713,000
Gross unrealized loss, total in loss position | (13,000) | (63,000)
Other Assets [Member] |  |
Minority Investments [Abstract] |  |
Investments in privately-held companies | $ 11,100,000 | $ 12,100,000

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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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