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Cash, Cash Equivalents and Investments - Investment Category and Length (Details) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 USD ($) entity | Dec. 31, 2018 USD ($) company | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) company | Dec. 31, 2016 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 | $ 9,892,000 | $ 9,892,000 | $ 9,892,000 | $ 29,527,000 |  |
Gross unrealized loss, in loss position less than twelve months | (32,000) | (32,000) | (32,000) | (85,000) |  |
Fair value, in loss position greater than twelve months | 12,935,000 | 12,935,000 | 12,935,000 | 2,342,000 |  |
Gross unrealized loss, in loss position greater than twelve months | (52,000) | (52,000) | (52,000) | (8,000) |  |
Fair value, total in loss position | 22,827,000 | 22,827,000 | 22,827,000 | 31,869,000 |  |
Gross unrealized loss, total in loss position | (84,000) | (84,000) | (84,000) | (93,000) |  |
Minority Investments |  |  |  |  |  |
Investments, equity method | $ 8,422,000 | $ 8,422,000 | 8,422,000 | 9,849,000 |  |
Equity method investments | 7 | 7 |  |  |  |
Impairment charge |  |  | 0 |  |  |
Cost method investments | $ 0 | $ 0 | 0 | 0 |  |
One Gallium Company |  |  |  |  |  |
Minority Investments |  |  |  |  |  |
Investments, equity method |  |  |  |  |  | $ 0
Impairment charge |  |  |  | $ 313,000 | $ 0 |
Number of gallium companies with impairment charge | company |  |  |  | 1 |  |
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 | 717,000 | 717,000 | 717,000 | $ 3,994,000 |  |
Gross unrealized loss, in loss position less than twelve months | (3,000) | (3,000) | (3,000) | (16,000) |  |
Fair value, in loss position greater than twelve months | 3,746,000 | 3,746,000 | 3,746,000 | 2,342,000 |  |
Gross unrealized loss, in loss position greater than twelve months | (24,000) | (24,000) | (24,000) | (8,000) |  |
Fair value, total in loss position | 4,463,000 | 4,463,000 | 4,463,000 | 6,336,000 |  |
Gross unrealized loss, total in loss position | (27,000) | (27,000) | (27,000) | (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 | 9,175,000 | 9,175,000 | 9,175,000 | 25,533,000 |  |
Gross unrealized loss, in loss position less than twelve months | (29,000) | (29,000) | (29,000) | (69,000) |  |
Fair value, in loss position greater than twelve months | 9,189,000 | 9,189,000 | 9,189,000 |  |  |
Gross unrealized loss, in loss position greater than twelve months | (28,000) | (28,000) | (28,000) |  |  |
Fair value, total in loss position | 18,364,000 | 18,364,000 | 18,364,000 | 25,533,000 |  |
Gross unrealized loss, total in loss position | (57,000) | (57,000) | (57,000) | (69,000) |  |
Other assets |  |  |  |  |  |
Minority Investments |  |  |  |  |  |
Investments, equity method | $ 8,400,000 | $ 8,400,000 | $ 8,400,000 | $ 9,800,000 |  |

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