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The Company and Summary of Significant Accounting Policies- Principles of Consolidation (Details)
 1 Months Ended 2 Months Ended 3 Months Ended 12 Months Ended
Jan. 25, 2021
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Nov. 30, 2024
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Jul. 31, 2024
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Jun. 30, 2024
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Dec. 31, 2023
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Aug. 31, 2023
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May 31, 2023
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Jan. 31, 2023
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Aug. 31, 2022
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Jul. 31, 2022
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May 31, 2022
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Apr. 30, 2022
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Jan. 31, 2022
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Jun. 30, 2021
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May 31, 2021
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Feb. 28, 2021
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Jan. 31, 2021
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Aug. 31, 2022
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Dec. 31, 2020
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Dec. 31, 2024
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company
Dec. 31, 2023
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company
Dec. 31, 2022
Dec. 31, 2020
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Sep. 30, 2023
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Jul. 31, 2023
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Sep. 30, 2022
Dec. 31, 2021
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Oct. 31, 2021
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Sep. 30, 2021
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Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]                                                          
Number of equity method investments | company                                       3 3                
Investments, equity method         $ 12,476,000                             $ 14,066,000 $ 12,476,000                
Payment for investment                                       $ 834,000 2,538,000                
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                           $ 1,000,000                              
Minority investors                                                          
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]                                                          
Loan amount           $ 200,000 $ 300,000 $ 200,000                                          
Chao Yang XinMei High Purity Semiconductor Materials Co. Ltd. | Loan from related party                                                          
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]                                                          
Increase in redeemable noncontrolling interests                     $ 100,000                                    
Chao Yang XinMei High Purity Semiconductor Materials Co. Ltd. | Loan from related party | ChaoYang Xinshuo                                                          
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]                                                          
Loan amount                                                       $ 1,000,000 $ 900,000
Sale of subsidiary shares to noncontrolling interests                       $ 1,900,000                                  
Amount paid to subsidiary                     600,000 700,000                                  
Chao Yang XinMei High Purity Semiconductor Materials Co. Ltd. | Loan from related party | Beijing Tongmei Xtal Technology                                                          
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]                                                          
Sale of subsidiary shares to noncontrolling interests                       2,600,000                                  
Amount paid to subsidiary                     800,000 1,100,000                                  
Increase in noncontrolling interest                     $ 1,400,000   $ 2,200,000                                
Increase in redeemable noncontrolling interests                         $ 200,000                                
Chao Yang XinMei High Purity Semiconductor Materials Co. Ltd.                                                          
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]                                                          
Ownership (as a percent)                   58.50% 58.50%   58.50%   58.50% 58.50%                          
Investment value, agreement amount                             $ 1,800,000 $ 3,000,000                          
Investments, equity method                               1,800,000                          
Initial funding                             1,500,000 1,500,000                          
Increase in noncontrolling interest                   $ 610,000                                      
Further investment                   600,000                                      
Redeemable noncontrolling interest increased                   57,000                                      
Chao Yang XinMei High Purity Semiconductor Materials Co. Ltd. | Loan from related party                                                          
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]                                                          
Sale of subsidiary shares to noncontrolling interests                       $ 4,500,000                                  
ChaoYang ShuoMei High Purity Semiconductor Materials Co., Ltd.                                                          
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]                                                          
Ownership (as a percent)           75.00%           75.00%                                  
Investment value, agreement amount                       $ 4,400,000                                  
Investments, equity method                       $ 3,300,000                                  
Initial funding                 $ 334,000                                        
Increase in noncontrolling interest           $ 200,000     406,000                                        
Increase in redeemable noncontrolling interests           44,000                                              
Redeemable noncontrolling interest increased                 $ 73,000                                        
ChaoYang KaiMei Quartz Co., Ltd                                                          
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]                                                          
Ownership (as a percent)   40.00%                   40.00%               40.00%                  
Investment value, agreement amount                       $ 7,600,000                                  
Investments, equity method         3,154,000 600,000   900,000       $ 3,000,000               $ 3,895,000 $ 3,154,000     $ 2,300,000 $ 600,000        
Initial funding                   2,200,000                                      
Investment amount                   900,000                                      
Additional investment                                               $ 5,600,000          
Payment for investment   $ 300,000 $ 300,000 $ 300,000 $ 600,000                                                
ChaoYang ShuoMei High Purity Semiconductor Materials Co., Ltd.                                                          
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]                                                          
Increase in noncontrolling interest             400,000 200,000                                          
Increase in redeemable noncontrolling interests             75,000 36,000                                          
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%       33.00%            
Beijing BoYu Semiconductor Vessel Craftwork Technology Co., Ltd Investment | 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                                                          
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]                                                          
Increase in redeemable noncontrolling interests                                 $ 1,500,000   $ 48,100,000       $ 48,100,000            
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                                   $ 48,100,000       $ 48,100,000            
Raised additional capital                                 $ 1,500,000                        
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]                                                          
Investment amount                               $ 900,000                          
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                                             0.0038%            
Beijing Tongmei Xtal Technology | Chao Yang XinMei High Purity Semiconductor Materials Co. Ltd.                                                          
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]                                                          
Loan amount                         $ 1,400,000                           $ 1,400,000    
Beijing Tongmei Xtal Technology | Chao Yang XinMei High Purity Semiconductor Materials Co. Ltd. | Loan from related party                                                          
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]                                                          
Increase in noncontrolling interest                     $ 1,400,000                                    
Beijing Tongmei Xtal Technology | Chao Yang XinMei High Purity Semiconductor Materials Co. Ltd.                                                          
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]                                                          
Initial funding                   800,000                                      
Investment amount                             $ 900,000                            
Further investment                   $ 800,000                                      
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%       8.50%            
Nanjing JinMei Gallium Co., Ltd Investment | 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%            
Chao Yang XinMei High Purity Semiconductor Materials Co. Ltd. | ChaoYang ShuoMei High Purity Semiconductor Materials Co., Ltd.                                                          
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]                                                          
Initial funding                                   $ 1,000,000                      
ChaoYang JinMei Gallium Ltd. | ChaoYang ShuoMei High Purity Semiconductor Materials Co., Ltd.                                                          
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]                                                          
Loan amount               $ 500,000                                          
ChaoYang JinMei Gallium Ltd. | ChaoYang ShuoMei High Purity Semiconductor Materials Co., Ltd. | ChaoYang ShuoMei High Purity Semiconductor Materials Co., Ltd.                                                          
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]                                                          
Loan amount           $ 600,000 $ 1,000,000