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Cash, Cash Equivalents and Investments - Investment Category and Length (Details) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 USD ($) entity company | Dec. 31, 2017 USD ($) company | Dec. 31, 2017 USD ($) company | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Mar. 31, 2017 USD ($)
Summary of fair value and gross unrealized losses related to available-for-sale securities [Abstract] |  |  |  |  |  |
Fair value, in loss position less than twelve months | $ 29,527,000 | $ 29,527,000 | $ 29,527,000 | $ 10,248,000 |  |
Gross unrealized loss, in loss position less than twelve months |  |  | (85,000) | (55,000) |  |
Fair value, in loss position greater than twelve months | 2,342,000 | 2,342,000 | 2,342,000 | 4,595,000 |  |
Gross unrealized loss, in loss position greater than twelve months |  |  | (8,000) | (12,000) |  |
Fair value, total in loss position | 31,869,000 | 31,869,000 | 31,869,000 | 14,843,000 |  |
Gross unrealized loss, total in loss position |  |  | (93,000) | (67,000) |  |
Minority Investments |  |  |  |  |  |
Investments in privately-held companies | $ 5,578,000 | $ 5,578,000 | 5,578,000 | 6,599,000 |  |
Equity method investments | 7 | 7 |  |  |  |
Cost method investments | $ 0 | $ 0 | $ 0 | 0 |  |
One Gallium Company |  |  |  |  |  |
Minority Investments |  |  |  |  |  |
Investments in privately-held companies |  |  |  |  |  | $ 0
Number of gallium companies with impairment charge | company | 1 | 1 | 1 |  |  |
Impairment charge |  |  | $ 313,000 | 0 | $ 0 |
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 | $ 3,994,000 | $ 3,994,000 | 3,994,000 | 5,211,000 |  |
Gross unrealized loss, in loss position less than twelve months |  |  | (16,000) | (20,000) |  |
Fair value, in loss position greater than twelve months | 2,342,000 | 2,342,000 | 2,342,000 | 1,200,000 |  |
Gross unrealized loss, in loss position greater than twelve months |  |  | (8,000) |  |  |
Fair value, total in loss position | 6,336,000 | 6,336,000 | 6,336,000 | 6,411,000 |  |
Gross unrealized loss, total in loss position |  |  | (24,000) | (20,000) |  |
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 | 25,533,000 | 25,533,000 | 25,533,000 | 5,037,000 |  |
Gross unrealized loss, in loss position less than twelve months |  |  | (69,000) | (35,000) |  |
Fair value, in loss position greater than twelve months |  |  |  | 3,395,000 |  |
Gross unrealized loss, in loss position greater than twelve months |  |  |  | (12,000) |  |
Fair value, total in loss position | 25,533,000 | 25,533,000 | 25,533,000 | 8,432,000 |  |
Gross unrealized loss, total in loss position |  |  | (69,000) | (47,000) |  |
Other assets |  |  |  |  |  |
Minority Investments |  |  |  |  |  |
Investments in privately-held companies | $ 9,800,000 | $ 9,800,000 | $ 9,800,000 | $ 11,300,000 |  |

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