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Investments and Fair Value Measurements - Investment Category and Length (Details) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2017 USD ($) entity | Mar. 31, 2017 USD ($) company | Mar. 31, 2017 USD ($) | Mar. 31, 2016 USD ($) | Dec. 31, 2016 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 | $ 25,884,000 | $ 25,884,000 | $ 25,884,000 |  | $ 10,248,000
Gross unrealized loss, in loss position less than twelve months |  |  | (78,000) |  | (55,000)
Fair value, in loss position greater than twelve months | 1,942,000 | 1,942,000 | 1,942,000 |  | 4,595,000
Gross unrealized loss, in loss position greater than twelve months |  |  | (1,000) |  | (12,000)
Fair value, total in loss position | 27,826,000 | 27,826,000 | 27,826,000 |  | 14,843,000
Gross unrealized loss, total in loss position |  |  | (79,000) |  | (67,000)
Minority Investments |  |  |  |  |
Investments in privately-held companies | $ 6,274,000 | $ 6,274,000 | 6,274,000 |  | 6,599,000
Equity method investments | 3 | 7 |  |  |
Investments held | $ 6,274,000 | $ 6,274,000 | 6,274,000 |  | 6,599,000
One Gallium Company |  |  |  |  |
Minority Investments |  |  |  |  |
Investments in privately-held companies | 0 | 0 | 0 |  |
Impairment charge |  |  | 313,000 | $ 0 |
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 | 4,260,000 | 4,260,000 | 4,260,000 |  | 5,211,000
Gross unrealized loss, in loss position less than twelve months |  |  | (10,000) |  | (20,000)
Fair value, in loss position greater than twelve months | 240,000 | 240,000 | 240,000 |  | 1,200,000
Fair value, total in loss position | 4,500,000 | 4,500,000 | 4,500,000 |  | 6,411,000
Gross unrealized loss, total in loss position |  |  | (10,000) |  | (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 | 21,624,000 | 21,624,000 | 21,624,000 |  | 5,037,000
Gross unrealized loss, in loss position less than twelve months |  |  | (68,000) |  | (35,000)
Fair value, in loss position greater than twelve months | 1,702,000 | 1,702,000 | 1,702,000 |  | 3,395,000
Gross unrealized loss, in loss position greater than twelve months |  |  | (1,000) |  | (12,000)
Fair value, total in loss position | 23,326,000 | 23,326,000 | 23,326,000 |  | 8,432,000
Gross unrealized loss, total in loss position |  |  | (69,000) |  | (47,000)
Other Assets [Member] |  |  |  |  |
Minority Investments |  |  |  |  |
Investments in privately-held companies | 10,400,000 | 10,400,000 | 10,400,000 |  | 11,300,000
Investments held | $ 10,400,000 | $ 10,400,000 | $ 10,400,000 |  | $ 11,300,000

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