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Investments and Fair Value Measurements - Investment Category and Length (Details) | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2018 USD ($) company | Mar. 31, 2017 USD ($) entity | Dec. 31, 2017 USD ($) | Mar. 31, 2017 company | Mar. 31, 2017 USD ($)
Summary of fair value and gross unrealized losses related to available-for-sale securities [Abstract] |  |  |  |  |
Fair value, in loss position less than twelve months | $ 18,088,000 |  | $ 29,527,000 |  |
Gross unrealized loss, in loss position less than twelve months | (142,000) |  | (85,000) |  |
Fair value, in loss position greater than twelve months | 9,598,000 |  | 2,342,000 |  |
Gross unrealized loss, in loss position greater than twelve months | (68,000) |  | (8,000) |  |
Fair value, total in loss position | 27,686,000 |  | 31,869,000 |  |
Gross unrealized loss, total in loss position | (210,000) |  | (93,000) |  |
Minority Investments |  |  |  |  |
Investments in privately-held companies | $ 5,453,000 |  | 5,578,000 |  |
Equity method investments | company | 7 |  |  |  |
Impairment charge | $ 0 |  |  |  |
One Gallium Company |  |  |  |  |
Minority Investments |  |  |  |  |
Investments in privately-held companies |  |  |  |  | $ 0
Number of gallium companies with impairment charge |  | 1 |  | 1 |
Impairment charge |  | $ 313,000 |  |  |
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 | 4,935,000 |  | 3,994,000 |  |
Gross unrealized loss, in loss position less than twelve months | (35,000) |  | (16,000) |  |
Fair value, in loss position greater than twelve months | 2,344,000 |  | 2,342,000 |  |
Gross unrealized loss, in loss position greater than twelve months | (6,000) |  | (8,000) |  |
Fair value, total in loss position | 7,279,000 |  | 6,336,000 |  |
Gross unrealized loss, total in loss position | (41,000) |  | (24,000) |  |
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 | 13,153,000 |  | 25,533,000 |  |
Gross unrealized loss, in loss position less than twelve months | (107,000) |  | (69,000) |  |
Fair value, in loss position greater than twelve months | 7,254,000 |  |  |  |
Gross unrealized loss, in loss position greater than twelve months | (62,000) |  |  |  |
Fair value, total in loss position | 20,407,000 |  | 25,533,000 |  |
Gross unrealized loss, total in loss position | (169,000) |  | (69,000) |  |
Other assets |  |  |  |  |
Minority Investments |  |  |  |  |
Investments in privately-held companies | $ 9,700,000 |  | $ 9,800,000 |  |

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