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The Company and Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2020
The Company and Summary of Significant Accounting Policies |
Schedule of amounts recorded in accrued liabilities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, | ​ | December 31, | ​
​ | ​ | 2020 | ​ | 2019 | ​
Contract liabilities | ​ | $ | (374) | ​ | $ | (396) | ​
During the three and twelve months ended December 31, 2020, the Company recognized $9,000 and $251,000, respectively, of revenue that was included in the contract balances as of December 31, 2019. | ​ | ​ | ​ | ​ | ​ | ​
Schedule of accumulated other comprehensive income (loss) |
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | As of December 31,
​ |  | 2020 | ​ | 2019
Accumulated other comprehensive income (loss): | ​ | ​ | ​ | ​ | ​ | ​
Unrealized gain ( loss) on investments, net | ​ | $ | 3 | ​ | $ | (3)
Cumulative translation adjustment | ​ |  | 3,601 | ​ | ​ | (4,842)
​ | ​ |  | 3,604 | ​ | ​ | (4,845)
Less: Cumulative translation adjustment attributable to noncontrolling interests | ​ | ​ | 395 | ​ | ​ | 17
Accumulated other comprehensive income (loss) attributable to AXT, Inc. | ​ | $ | 3,209 | ​ | $ | (4,862)

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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=118930883&loc=SL7669686-108580 + Details
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