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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES, COVID-19 Assessment (Details) - County | 1 Months Ended
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Mar. 31, 2020 | Feb. 29, 2020
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES [Abstract] |  |
Number of days headquarters closed |  | 6 days
Number of San Francisco Bay Area counties | 6 |

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- Definition Number of days headquarters were closed beyond the normal Lunar New Year Holiday in accordance with Shanghai government restrictions related to the outbreak. + References No definition available. + Details
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Namespace Prefix: | acmr_
Data Type: | xbrli:durationItemType
Balance Type: | na
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- Definition Refers to the number of counties in which health officers issued shelter in place orders. + References No definition available. + Details
Name: | acmr_NumberOfSanFranciscoBayAreaCounties
Namespace Prefix: | acmr_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_AccountingPoliciesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration