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The Company and Summary of Significant Accounting Policies - Foreign Currency Translation (Details)			1 Months Ended				12 Months Ended
	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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