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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 ($) | Jun. 15, 2018 USD ($) | Jan. 31, 2021 USD ($) | Aug. 31, 2020 USD ($) | May 31, 2019 USD ($) | Sep. 30, 2018 USD ($) | Dec. 31, 2021 USD ($) company | Dec. 31, 2020 USD ($) company | Dec. 31, 2019 USD ($) | Jun. 30, 2021 USD ($) | 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 |  |  |  |  |  |  | $ 18,317,000 | $ 15,350,000 |  |  |  |  |  |  |  |  |
Transaction results in increase to redeemable noncontrolling interests |  |  |  |  |  |  | 1,241,000 |  |  |  |  |  |  |  |  |  |
Foreign Currency Translation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Foreign exchange gain (loss) |  |  |  |  |  |  | $ (434,000) | $ (411,000) | $ 321,000 |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |
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 Jin Mei Gallium Co., Ltd [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
The Company and Summary of Significant Accounting Policies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of ownership, consolidated method (in hundredths) |  |  |  | 91.50% |  |  |  |  |  |  | 100.00% |  |  |  |  |  |
Percentage Of Ownership Interest Sold |  |  |  | 8.50% |  |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  | 0.38% |  |  |  |  |  |  |  |  |
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 noncontrolling interests |  |  |  |  |  |  |  | 7.59% |  |  |  |  |  |  |  |  |
Beijing Tongmei Xtal Technology | Nanjing JinMei Gallium Co., Ltd Investment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
The Company and Summary of Significant Accounting Policies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of equity issued on conversion of noncontrolling interests |  |  |  |  |  |  |  | 0.38% |  |  |  |  |  |  |  |  |
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% |  |  |  |  | 85.50% |  |  |  |  |  |  |  |  | 95.00% | 83.00%
ChaoYang Jin Mei Gallium Co., Ltd [Member] | ChaoYang Jin Mei Gallium Co., Ltd [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
The Company and Summary of Significant Accounting Policies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of ownership, consolidated method (in hundredths) |  |  |  | 91.50% |  |  | 85.50% |  |  |  | 100.00% |  |  |  |  |  |
Purchase of subsidiary shares from noncontrolling interest |  |  |  | $ 396,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage Of Ownership Interest Sold |  |  |  | 8.50% |  |  |  |  |  |  |  |  |  |  |  |  |

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