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Investments and Fair Value Measurements - Investment Category and Length (Details) | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Sep. 30, 2017 USD ($) company entity | Sep. 30, 2017 USD ($) company entity | 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 | $ 26,166,000 | $ 26,166,000 | $ 10,248,000 |
Gross unrealized loss, in loss position less than twelve months |  | (48,000) | (55,000) |
Fair value, in loss position greater than twelve months | 2,344,000 | 2,344,000 | 4,595,000 |
Gross unrealized loss, in loss position greater than twelve months |  | (6,000) | (12,000) |
Fair value, total in loss position | 28,510,000 | 28,510,000 | 14,843,000 |
Gross unrealized loss, total in loss position |  | (54,000) | (67,000) |
Minority Investments |  |  |  |
Investments in privately-held companies | $ 6,015,000 | $ 6,015,000 | 6,599,000 |
Number of gallium companies with impairment charge | entity | 1 | 1 |  |
Equity method investments | entity |  | 7 |  |
Impairment charge | $ 0 | $ 0 |  |
Investments held | 6,015,000 | 6,015,000 | 6,599,000 |
One Gallium Company |  |  |  |
Minority Investments |  |  |  |
Investments in privately-held companies | $ 0 | $ 0 |  | $ 0
Number of gallium companies with impairment charge | company | 1 | 1 |  |
Impairment charge | $ 0 | $ 313,000 |  |
Investments held | 0 | 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 | 2,564,000 | 2,564,000 | 5,211,000 |
Gross unrealized loss, in loss position less than twelve months |  | (6,000) | (20,000) |
Fair value, in loss position greater than twelve months | 2,344,000 | 2,344,000 | 1,200,000 |
Gross unrealized loss, in loss position greater than twelve months |  | (6,000) |  |
Fair value, total in loss position | 4,908,000 | 4,908,000 | 6,411,000 |
Gross unrealized loss, total in loss position |  | (12,000) | (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 | 23,602,000 | 23,602,000 | 5,037,000 |
Gross unrealized loss, in loss position less than twelve months |  | (42,000) | (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 | 23,602,000 | 23,602,000 | 8,432,000 |
Gross unrealized loss, total in loss position |  | (42,000) | (47,000) |
Other Assets [Member] |  |  |  |
Minority Investments |  |  |  |
Investments in privately-held companies | 10,100,000 | 10,100,000 | 11,300,000 |
Investments held | $ 10,100,000 | $ 10,100,000 | $ 11,300,000 |

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