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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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Jan. 25, 2021 USD ($) | Jun. 30, 2021 USD ($) | Dec. 31, 2022 USD ($) company | Dec. 31, 2021 USD ($) company | Dec. 31, 2020 USD ($) | Sep. 30, 2022 | Aug. 31, 2020 | Jul. 31, 2020
The Company and Summary of Significant Accounting Policies |  |  |  |  |  |  |  |
Number of equity method investments | company |  |  | 6 | 5 |  |  |  |
Transaction results in increase to redeemable noncontrolling interests |  |  |  | $ 1,241,000 |  |  |  |
Foreign Currency Translation |  |  |  |  |  |  |  |
Foreign exchange gain (loss) |  |  | $ 1,573,000 | (434,000) | $ (411,000) |  |  |
Disposal Group, Disposed of by Sale, Not Discontinued Operations | AXT-Tongmei, Inc |  |  |  |  |  |  |  |
The Company and Summary of Significant Accounting Policies |  |  |  |  |  |  |  |
Cash consideration |  | $ 1,000,000 |  |  |  |  |  |
Nanjing JinMei Gallium Co., Ltd Investment |  |  |  |  |  |  |  |
The Company and Summary of Significant Accounting Policies |  |  |  |  |  |  |  |
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners |  |  |  |  | 8.50% |  |  |
Nanjing JinMei Gallium Co., Ltd Investment | Nanjing JinMei Gallium Co., Ltd |  |  |  |  |  |  |  |
The Company and Summary of Significant Accounting Policies |  |  |  |  |  |  |  |
Percentage of equity issued on conversion of noncontrolling interests |  |  |  |  | 0.38% |  |  |
Beijing Tongmei Xtal Technology |  |  |  |  |  |  |  |
The Company and Summary of Significant Accounting Policies |  |  |  |  |  |  |  |
Percentage of ownership, consolidated method (in hundredths) |  | 85.50% |  |  |  |  |  |
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners | 7.28% |  |  |  |  | 14.50% |  |
Percentage of equity issued on conversion of noncontrolling interests | 7.28% |  | 14.50% |  |  |  |  |
Percentage of Equity Purchased by Employees, Key Managers and Contributors |  |  |  |  | 0.40% |  |  |
Investment in new facility | $ 49,000,000 |  |  |  | $ 48,100,000 |  |  |
Raised additional capital |  |  |  | $ 1,500,000 |  |  |  |
Transaction results in increase to noncontrolling interests |  | $ 1,200,000 |  |  |  |  |  |
Transaction results in increase to redeemable noncontrolling interests |  | $ 1,200,000 |  |  |  |  |  |
Beijing Tongmei Xtal Technology | Nanjing JinMei Gallium Co., Ltd |  |  |  |  |  |  |  |
The Company and Summary of Significant Accounting Policies |  |  |  |  |  |  |  |
Percentage of equity issued on conversion of noncontrolling interests |  |  |  |  | 0.0038% |  |  |
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) |  |  | 85.50% |  |  |  |  |
ChaoYang Jin Mei Gallium Co., Ltd | ChaoYang Jin Mei Gallium Co., Ltd |  |  |  |  |  |  |  |
The Company and Summary of Significant Accounting Policies |  |  |  |  |  |  |  |
Percentage of ownership, consolidated method (in hundredths) |  |  | 85.50% |  |  |  | 91.50% | 100.00%

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