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Cash, Cash Equivalents and Investments - Investment Category and Length (Details) | 12 Months Ended
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Dec. 31, 2021 USD ($) company | Dec. 31, 2020 USD ($) company | Dec. 31, 2019 USD ($) subsidiary
Summary of fair value and gross unrealized losses related to available-for-sale securities [Abstract] |  |  |
Fair value, in loss position less than twelve months | $ 12,151,000 | $ 2,048,000 |
Gross unrealized (loss), in loss position less than twelve months | (61,000) | (2,000) |
Fair value, in loss position greater than twelve months | 2,013,000 |  |
Gross unrealized (loss), in loss position greater than twelve months | (4,000) |  |
Fair value, total in loss position | 14,164,000 | 2,048,000 |
Gross unrealized (loss), total in loss position | (65,000) | (2,000) |
Minority Investments |  |  |
Investments, equity method | $ 10,166,000 | $ 6,376,000 |
Number of equity method investments | company | 5 | 5 |
Impairment charge | $ 0 | $ 0 |
Number of consolidated subsidiaries | subsidiary |  |  | 1
One Gallium Company |  |  |
Minority Investments |  |  |
Impairment charge |  |  | $ 1,100,000
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 | 6,181,000 |  |
Gross unrealized (loss), in loss position less than twelve months | (19,000) |  |
Fair value, total in loss position | 6,181,000 |  |
Gross unrealized (loss), total in loss position | (19,000) |  |
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 | 5,970,000 | 2,048,000 |
Gross unrealized (loss), in loss position less than twelve months | (42,000) | (2,000) |
Fair value, in loss position greater than twelve months | 2,013,000 |  |
Gross unrealized (loss), in loss position greater than twelve months | (4,000) |  |
Fair value, total in loss position | 7,983,000 | 2,048,000 |
Gross unrealized (loss), total in loss position | (46,000) | (2,000) |
Other Assets [Member] |  |  |
Minority Investments |  |  |
Investments, equity method | $ 10,200,000 | $ 6,400,000 |

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