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The Company and Summary of Significant Accounting Policies - Foreign Currency Translation (Details) |  | 1 Months Ended | 12 Months Ended |  |  |  |  |  |  |
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Jun. 15, 2018 USD ($) | Aug. 31, 2020 USD ($) | May 31, 2019 USD ($) | Sep. 30, 2018 USD ($) | Dec. 31, 2020 USD ($) company | Dec. 31, 2019 USD ($) company | Dec. 31, 2018 USD ($) | Jul. 31, 2020 | Jun. 01, 2019 USD ($) | Apr. 30, 2019 | Mar. 11, 2019 | Mar. 10, 2019 | Aug. 31, 2018 | Jun. 14, 2018
The Company and Summary of Significant Accounting Policies |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of equity method investments | company |  |  |  |  | 5 | 5 |  |  |  |  |  |  |  |
Noncontrolling interests |  |  |  |  | $ 15,350,000 | $ 4,877,000 |  |  |  |  |  |  |  |
Foreign Currency Translation |  |  |  |  |  |  |  |  |  |  |  |  |  |
Foreign exchange gain (loss) |  |  |  |  | $ (411,000) | $ 321,000 | $ 165,000 |  |  |  |  |  |  |
Beijing JiYa Semiconductor Material Co., Ltd |  |  |  |  |  |  |  |  |  |  |  |  |  |
The Company and Summary of Significant Accounting Policies |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of ownership, consolidated method (in hundredths) |  |  |  |  |  |  |  |  |  |  | 39.00% | 46.00% |  |
Nanjing JinMei Gallium Co., Ltd Investment |  |  |  |  |  |  |  |  |  |  |  |  |  |
The Company and Summary of Significant Accounting Policies |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of ownership, consolidated method (in hundredths) |  |  | 100.00% | 97.00% |  |  |  |  |  | 97.00% |  |  |  |
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners |  |  |  |  | 8.50% |  |  |  |  |  |  |  |  |
Chaoyang JinMei Gallium Co., Ltd[member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
The Company and Summary of Significant Accounting Policies |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of ownership, consolidated method (in hundredths) |  | 91.50% |  |  |  |  |  | 100.00% |  |  |  |  |  |
Beijing BoYu Semiconductor Vessel Craftwork Technology Co |  |  |  |  |  |  |  |  |  |  |  |  |  |
The Company and Summary of Significant Accounting Policies |  |  |  |  |  |  |  |  |  |  |  |  |  |
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners |  |  |  |  | 33.00% |  |  |  |  |  |  |  |  |
Beijing Tongmei Xtal Technology |  |  |  |  |  |  |  |  |  |  |  |  |  |
The Company and Summary of Significant Accounting Policies |  |  |  |  |  |  |  |  |  |  |  |  |  |
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners |  |  |  |  | 8.37% |  |  |  |  |  |  |  |  |
Percentage of Equity Purchased by Employees, Key Managers and Contributors |  |  |  |  | 0.40% |  |  |  |  |  |  |  |  |
Beijing Tongmei Xtal Technology | Nanjing JinMei Gallium Co., Ltd |  |  |  |  |  |  |  |  |  |  |  |  |  |
The Company and Summary of Significant Accounting Policies |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of equity issued on conversion of non controlling interests |  |  |  |  | 0.38% |  |  |  |  |  |  |  |  |
Beijing Tongmei Xtal Technology | Beijing BoYu Semiconductor Vessel Craftwork Technology Co |  |  |  |  |  |  |  |  |  |  |  |  |  |
The Company and Summary of Significant Accounting Policies |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of equity issued on conversion of non controlling interests |  |  |  |  | 7.59% |  |  |  |  |  |  |  |  |
Nanjing JinMei Gallium Co., Ltd Investment |  |  |  |  |  |  |  |  |  |  |  |  |  |
The Company and Summary of Significant Accounting Policies |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase of subsidiary shares from noncontrolling interest | $ 1,400,000 |  | $ 413,000 | $ 252,000 |  |  |  |  |  |  |  |  |  |
Additional percentage of ownership, consolidated method | 12 |  | 3 | 2 |  |  |  |  |  |  |  |  |  |
Noncontrolling interests |  |  |  |  |  |  |  |  | $ 0 |  |  |  |  |
Nanjing JinMei Gallium Co., Ltd Investment | Nanjing JinMei Gallium Co., Ltd Investment |  |  |  |  |  |  |  |  |  |  |  |  |  |
The Company and Summary of Significant Accounting Policies |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of ownership, consolidated method (in hundredths) | 95.00% |  |  |  | 100.00% |  |  |  |  |  |  |  | 95.00% | 83.00%
Chaoyang JinMei Gallium Co., Ltd[member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
The Company and Summary of Significant Accounting Policies |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase of subsidiary shares from noncontrolling interest |  | $ 396,000 |  |  |  |  |  |  |  |  |  |  |  |
Percentage Of Ownership Interest Sold |  | 8.50% |  |  |  |  |  |  |  |  |  |  |  |
Chaoyang JinMei Gallium Co., Ltd[member] | Chaoyang JinMei Gallium Co., Ltd[member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
The Company and Summary of Significant Accounting Policies |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of ownership, consolidated method (in hundredths) |  | 91.50% |  |  | 100.00% |  |  | 100.00% |  |  |  |  |  |
Percentage Of Ownership Interest Sold |  | 8.50% |  |  |  |  |  |  |  |  |  |  |  |

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