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Basis of Presentation (Details) |  | 1 Months Ended | 9 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jan. 25, 2021 USD ($) | May 31, 2021 USD ($) | Feb. 28, 2021 USD ($) | Jan. 31, 2021 USD ($) | Sep. 30, 2021 USD ($) company | Dec. 31, 2020 USD ($) company | Jun. 30, 2021 USD ($) | Dec. 31, 2019 | May 31, 2019 | Apr. 30, 2019
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 |  |  |  |  | $ 9,340,000 | $ 6,376,000 |  |  |  |
Transaction results in increase to redeemable noncontrolling interests |  |  |  |  | $ 1,242,000 |  |  |  |  |
AXT-Tongmei, Inc | Disposal Group, Disposed of by Sale, Not Discontinued Operations |  |  |  |  |  |  |  |  |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |  |  |  |  |  |  |  |  |
Cash consideration |  |  |  |  |  |  | $ 1 |  |  |
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 |  | $ 1,800,000 | $ 3,000,000.0 |  |  |  |  |  |  |
Investments, equity method |  |  | $ 1,800,000 |  |  |  |  |  |  |
Ownership (as a percent) |  | 58.50% | 58.50% |  |  |  |  |  |  |
Initial funding |  | $ 1,500,000 | $ 1,500,000 |  |  |  |  |  |  |
Beijing Tongmei Xtal Technology |  |  |  |  |  |  |  |  |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |  |  |  |  |  |  |  |  |
Investment in new facility |  |  |  |  |  | $ 48,100,000 |  |  |  |
Raised additional capital |  |  |  | $ 1,500,000 |  |  |  |  |  |
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% |  |  |  |
Percentage of ownership |  |  |  |  |  | 67.00% |  | 63.00% |  |
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 | $ 49,000,000 |  |  |  |  |  |  |  |  |
Percentage of ownership |  |  |  |  | 85.50% |  |  |  |  |
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 | 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 |  | $ 900,000 | $ 900,000 |  |  |  |  |  |  |
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% |  |  |  |
Percentage of ownership |  |  |  |  |  |  |  |  | 100.00% | 97.00%

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