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The Company and Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2021
The Company and Summary of Significant Accounting Policies |
Schedule of amounts recorded in accrued liabilities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, | ​ | December 31, | ​
​ | ​ | 2021 | ​ | 2020 | ​
Contract liabilities | ​ | $ | 946 | ​ | $ | 374 | ​
During the three and twelve months ended December 31, 2021, the Company recognized $3,000 and $266,000, respectively, of revenue that was included in the contract balances as of December 31, 2020. | ​ | ​ | ​ | ​ | ​ | ​
Schedule of accumulated other comprehensive income (loss) |
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | As of December 31,
​ |  | 2021 | ​ | 2020
Accumulated other comprehensive income: | ​ | ​ | ​ | ​ | ​ | ​
Unrealized gain (loss) on investments, net | ​ | $ | (65) | ​ | $ | 3
Cumulative translation adjustment | ​ |  | 7,041 | ​ | ​ | 3,601
​ | ​ |  | 6,976 | ​ | ​ | 3,604
Less: Cumulative translation adjustment attributable to noncontrolling interests and redeemable noncontrolling interests | ​ | ​ | 674 | ​ | ​ | 395
Accumulated other comprehensive income attributable to AXT, Inc. | ​ | $ | 6,302 | ​ | $ | 3,209

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