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Basis of Presentation (Details) $ in Thousands |  | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Jan. 25, 2021 USD ($) | Feb. 28, 2021 USD ($) | Jan. 31, 2021 USD ($) | Mar. 31, 2021 USD ($) company | Dec. 31, 2020 USD ($) company
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |  |  |  |
Number of equity method investments | company |  |  |  | 5 | 5
Investments, equity method |  |  |  | $ 7,468 | $ 6,376
ChaoYang XinMei High Purity Semiconductor Materials Co., Ltd |  |  |  |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |  |  |  |
Investment value, agreement amount |  | $ 3,000 |  |  |
Investments, equity method |  | $ 1,800 |  |  |
Ownership (as a percent) |  | 58.50% |  |  |
Initial funding |  | $ 1,500 |  |  |
Beijing Tongmei Xtal Technology |  |  |  |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |  |  |  |
Investment in new facility |  |  |  |  | $ 48,100
Raised additional capital |  |  | $ 1,500 |  |
Beijing BoYu Semiconductor Vessel Craftwork Technology Co., Ltd Investment |  |  |  |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |  |  |  |
Percentage of outstanding shares |  |  |  |  | 33.00%
Beijing Tongmei Xtal Technology |  |  |  |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |  |  |  |
Percentage of outstanding shares | 7.28% |  |  | 14.50% |
Private equity ownership percentage | 7.28% |  |  | 14.50% |
Percentage of key managers and contributors purchased |  |  |  |  | 0.40%
Investment in new facility | $ 49,000 |  |  |  |
Beijing Tongmei Xtal Technology | Beijing Boyu Semiconductor Vessel Craftwork Technology Co Ltd |  |  |  |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |  |  |  |
Private equity ownership percentage |  |  |  |  | 7.59%
Beijing Tongmei Xtal Technology | Nanjing JinMei Gallium Co., Ltd |  |  |  |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |  |  |  |
Private equity ownership percentage |  |  |  |  | 0.38%
Beijing Tongmei Xtal Technology | ChaoYang XinMei High Purity Semiconductor Materials Co., Ltd |  |  |  |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |  |  |  |
Investment amount |  | $ 900 |  |  |
Nanjing JinMei Gallium Co., Ltd Investment |  |  |  |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |  |  |  |
Percentage of outstanding shares |  |  |  |  | 8.50%

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