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Cash, Cash Equivalents and Investments - Investment Category and Length (Details) |  | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
May 31, 2023 USD ($) | Dec. 31, 2023 USD ($) | Jun. 30, 2023 USD ($) | May 31, 2023 USD ($) | Jan. 31, 2023 USD ($) | Dec. 31, 2023 USD ($) company | Dec. 31, 2022 USD ($) company | Dec. 31, 2021 USD ($) | May 31, 2022 USD ($) | Apr. 30, 2022 USD ($)
Summary of fair value and gross unrealized losses related to available-for-sale securities [Abstract] |  |  |  |  |  |  |  |  |  |
Fair value, in loss position less than twelve months |  |  |  |  |  |  | $ 2,118,000 |  |  |
Gross unrealized (loss), in loss position less than twelve months |  |  |  |  |  |  | (42,000) |  |  |
Fair value, in loss position greater than twelve months |  | $ 2,140,000 |  |  |  | $ 2,140,000 | 8,988,000 |  |  |
Gross unrealized (loss), in loss position greater than twelve months |  | (20,000) |  |  |  | (20,000) | (261,000) |  |  |
Fair value, total in loss position |  | 2,140,000 |  |  |  | 2,140,000 | 11,106,000 |  |  |
Gross unrealized (loss), total in loss position |  | (20,000) |  |  |  | (20,000) | (303,000) |  |  |
Restricted Cash |  |  |  |  |  |  |  |  |  |
Proceeds from short-term bank loans |  |  |  |  |  | 56,470,000 | 53,078,000 | $ 20,543,000 |  |
Restricted cash |  | 12,362,000 |  |  |  | 12,362,000 | 6,400,000 |  |  |
Minority Investments |  |  |  |  |  |  |  |  |  |
Investments, equity method |  | 12,476,000 |  |  |  | $ 12,476,000 | $ 12,720,000 |  |  |
Number of equity method investments | company |  |  |  |  |  | 3 | 6 |  |  |
Proceeds from sale of equity method investments |  |  |  |  |  | $ 827,000 |  |  |  |
Investment, cost method |  | 551,000 |  |  |  | 551,000 | $ 1,887,000 |  |  |
Loss on sale of equity investment |  |  |  |  |  | (166,000) |  |  |  |
Bank Of Beijing |  |  |  |  |  |  |  |  |  |
Restricted Cash |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  |  |  | $ 3,400,000 |
Bank Of Beijing | Secured debt |  |  |  |  |  |  |  |  |  |
Restricted Cash |  |  |  |  |  |  |  |  |  |
Time deposit |  |  |  |  |  |  | 2,500,000 |  | $ 1,000,000.0 | $ 2,900,000
Proceeds from short-term bank loans |  |  |  |  | $ 2,300,000 |  |  |  |  |
June 2023 bank loan two | Secured debt |  |  |  |  |  |  |  |  |  |
Restricted Cash |  |  |  |  |  |  |  |  |  |
Time deposit |  | 3,900,000 |  |  |  | 3,900,000 |  |  |  |
Proceeds from short-term bank loans |  |  |  |  |  | 3,500,000 |  |  |  |
June 2023 bank loan one | Secured debt |  |  |  |  |  |  |  |  |  |
Restricted Cash |  |  |  |  |  |  |  |  |  |
Time deposit |  | 1,500,000 | $ 1,500,000 |  |  | $ 1,500,000 |  |  |  |
Proceeds from short-term bank loans |  | $ 1,400,000 | $ 1,400,000 |  |  |  |  |  |  |
Bank Of China | Secured debt |  |  |  |  |  |  |  |  |  |
Restricted Cash |  |  |  |  |  |  |  |  |  |
Time deposit |  |  |  |  | 3,000,000.0 |  |  |  |  |
Proceeds from short-term bank loans |  |  |  |  | $ 2,900,000 |  |  |  |  |
Emeishan Jia Mei High Purity Metals Co., Ltd Investment |  |  |  |  |  |  |  |  |  |
Minority Investments |  |  |  |  |  |  |  |  |  |
Investments, equity method |  |  |  |  |  |  | 418,000 |  |  |
Ownership (as a percent) | 25.00% | 10.00% |  | 25.00% |  | 10.00% |  |  |  |
Proceeds from sale of equity method investments | $ 10 |  |  | $ 827,000 |  |  |  |  |  |
Investment, cost method |  | $ 551,000 |  |  |  | $ 551,000 |  |  |  |
Equity ownership percentage | 10.00% | 10.00% |  | 10.00% |  | 10.00% |  |  |  |
Loss on sale of equity investment |  |  |  | $ 575,000 |  | $ 575,000 |  |  |  |
Beijing JiYa Semiconductor Material Co., Ltd Investment |  |  |  |  |  |  |  |  |  |
Minority Investments |  |  |  |  |  |  |  |  |  |
Investments, equity method |  | $ 3,806,000 |  |  |  | $ 3,806,000 | 6,381,000 |  |  |
Ownership (as a percent) |  | 39.00% |  |  |  | 39.00% |  |  |  |
Certificates of deposit. |  |  |  |  |  |  |  |  |  |
Summary of fair value and gross unrealized losses related to available-for-sale securities [Abstract] |  |  |  |  |  |  |  |  |  |
Fair value, in loss position less than twelve months |  |  |  |  |  |  | 2,118,000 |  |  |
Gross unrealized (loss), in loss position less than twelve months |  |  |  |  |  |  | (42,000) |  |  |
Fair value, in loss position greater than twelve months |  | $ 2,140,000 |  |  |  | $ 2,140,000 | 4,146,000 |  |  |
Gross unrealized (loss), in loss position greater than twelve months |  | (20,000) |  |  |  | (20,000) | (133,000) |  |  |
Fair value, total in loss position |  | 2,140,000 |  |  |  | 2,140,000 | 6,264,000 |  |  |
Gross unrealized (loss), total in loss position |  | (20,000) |  |  |  | (20,000) | (175,000) |  |  |
Corporate bonds |  |  |  |  |  |  |  |  |  |
Summary of fair value and gross unrealized losses related to available-for-sale securities [Abstract] |  |  |  |  |  |  |  |  |  |
Fair value, in loss position greater than twelve months |  |  |  |  |  |  | 4,842,000 |  |  |
Gross unrealized (loss), in loss position greater than twelve months |  |  |  |  |  |  | (128,000) |  |  |
Fair value, total in loss position |  |  |  |  |  |  | 4,842,000 |  |  |
Gross unrealized (loss), total in loss position |  |  |  |  |  |  | (128,000) |  |  |
Other assets |  |  |  |  |  |  |  |  |  |
Minority Investments |  |  |  |  |  |  |  |  |  |
Investments, equity method |  | $ 12,500,000 |  |  |  | $ 12,500,000 | $ 14,600,000 |  |  |

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