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Investments and Fair Value Measurements - Investment Category and Length (Details) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2020 USD ($) | Jun. 30, 2019 USD ($) | Mar. 31, 2019 USD ($) | Jun. 30, 2020 USD ($) company | Jun. 30, 2019 USD ($) | Dec. 31, 2019 USD ($) company
Summary of fair value and gross unrealized losses related to available-for-sale securities [Abstract] |  |  |  |  |  |
Fair value, in loss position less than twelve months |  |  |  |  |  | $ 4,515
Gross unrealized loss, in loss position less than twelve months |  |  |  |  |  | (9)
Fair value, total in loss position |  |  |  |  |  | 4,515
Gross unrealized loss, total in loss position |  |  |  |  |  | (9)
Minority Investments |  |  |  |  |  |
Investments, equity method | $ 5,613 |  |  | $ 5,613 |  | $ 5,961
Number of equity method investments | company |  |  |  | 5 |  | 5
Impairment charge | 0 | $ 0 | $ 1,100 | $ 0 | $ 1,100 |
Xilingol Tongli Germanium Co. Ltd Investment | Xilingol Tongli Germanium Co. Ltd Investment |  |  |  |  |  |
Minority Investments |  |  |  |  |  |
Investments, equity method | $ 0 |  |  | $ 0 |  |
Ownership (as a percent) | 25.00% |  |  | 25.00% |  |
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 |  |  |  |  |  | $ 4,515
Gross unrealized loss, in loss position less than twelve months |  |  |  |  |  | (9)
Fair value, total in loss position |  |  |  |  |  | 4,515
Gross unrealized loss, total in loss position |  |  |  |  |  | (9)
Other assets |  |  |  |  |  |
Minority Investments |  |  |  |  |  |
Investments, equity method | $ 5,600 |  |  | $ 5,600 |  | $ 6,000

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