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Investments and Fair Value Measurements - Investment Category and Length (Details) | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
May 31, 2023 USD ($) | Jan. 31, 2023 USD ($) | Sep. 30, 2023 USD ($) | Jun. 30, 2023 USD ($) | Sep. 30, 2022 USD ($) | Sep. 30, 2023 USD ($) company | Sep. 30, 2022 USD ($) | Dec. 31, 2022 USD ($) company | 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 |  |  | $ 4,270,000 |  |  | $ 4,270,000 |  | 8,988,000 |  |
Gross unrealized (loss), in loss position greater than twelve months |  |  | (50,000) |  |  | (50,000) |  | (261,000) |  |
Fair value, total in loss position |  |  | 4,270,000 |  |  | 4,270,000 |  | 11,106,000 |  |
Gross unrealized (loss), total in loss position |  |  | (50,000) |  |  | (50,000) |  | (303,000) |  |
Restricted Cash |  |  |  |  |  |  |  |  |  |
Proceeds from bank loans |  |  |  |  |  | 42,197,000 | $ 42,352,000 |  |  |
Restricted cash |  |  | 10,778,000 |  |  | 10,778,000 |  | 6,400,000 |  |
Minority Investments |  |  |  |  |  |  |  |  |  |
Investments, equity method |  |  | 13,201,000 |  |  | $ 13,201,000 |  | $ 14,607,000 |  |
Number of equity method investments | company |  |  |  |  |  | 4 |  | 5 |  |
Proceeds from sale of equity method investments |  |  |  |  |  | $ 827,000 |  |  |  |
Investment, cost method |  |  | 551,000 |  |  | 551,000 |  |  |  |
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 bank loans |  | $ 2,300,000 |  |  |  |  |  |  |  |
June 2023 bank loan two | Secured debt |  |  |  |  |  |  |  |  |  |
Restricted Cash |  |  |  |  |  |  |  |  |  |
Time deposit |  |  | 3,900,000 |  |  | 3,900,000 |  |  |  |
Proceeds from bank loans |  |  |  |  |  | 3,500,000 |  |  |  |
June 2023 bank loan one | Secured debt |  |  |  |  |  |  |  |  |  |
Restricted Cash |  |  |  |  |  |  |  |  |  |
Time deposit |  |  | $ 1,500,000 |  |  | 1,500,000 |  |  |  |
Proceeds from bank loans |  |  |  |  |  | $ 1,400,000 |  |  |  |
Bank Of China | Secured debt |  |  |  |  |  |  |  |  |  |
Restricted Cash |  |  |  |  |  |  |  |  |  |
Time deposit |  | 3,000,000.0 |  |  |  |  |  |  |  |
Proceeds from 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% |  |  | 10.00% |  |  |  |
Proceeds from sale of equity method investments | $ 827,000 |  |  |  |  |  |  |  |  |
Investment, cost method |  |  | $ 551,000 |  |  | $ 551,000 |  |  |  |
Equity ownership percentage | 10.00% |  | 10.00% |  |  | 10.00% |  |  |  |
Gain from share sale | $ 575,000 |  |  |  |  | $ 575,000 |  |  |  |
Beijing JiYa Semiconductor Material Co., Ltd Investment |  |  |  |  |  |  |  |  |  |
Minority Investments |  |  |  |  |  |  |  |  |  |
Investments, equity method |  |  | $ 4,004,000 |  |  | 4,004,000 |  | 6,381,000 |  |
Impairment charge on equity investee |  |  |  | $ 754,000 |  |  |  |  |  |
Equity investment carrying value of asset after write down |  |  | $ 0 |  |  | $ 0 |  |  |  |
Ownership (as a percent) |  |  | 39.00% |  |  | 39.00% |  |  |  |
Investments Excluding Beijing JiYa Semiconductor Material Co., Ltd. |  |  |  |  |  |  |  |  |  |
Minority Investments |  |  |  |  |  |  |  |  |  |
Impairment charge on equity investee |  |  | $ 0 |  | $ 0 | $ 0 | $ 0 |  |  |
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 |  |  | 4,270,000 |  |  | 4,270,000 |  | 4,146,000 |  |
Gross unrealized (loss), in loss position greater than twelve months |  |  | (50,000) |  |  | (50,000) |  | (133,000) |  |
Fair value, total in loss position |  |  | 4,270,000 |  |  | 4,270,000 |  | 6,264,000 |  |
Gross unrealized (loss), total in loss position |  |  | (50,000) |  |  | (50,000) |  | (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 |  |  | 13,200,000 |  |  | 13,200,000 |  | $ 14,600,000 |  |
Other noncurrent assets | Emeishan Jia Mei High Purity Metals Co., Ltd Investment |  |  |  |  |  |  |  |  |  |
Minority Investments |  |  |  |  |  |  |  |  |  |
Investment, cost method |  |  | $ 551,000 |  |  | $ 551,000 |  |  |  |

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