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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES, COVID-19 Assessment (Details) - County	1 Months Ended
	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

X

- 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

Name:	acmr_NumberOfDaysHeadquartersClosed
Namespace Prefix:	acmr_
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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

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
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Period Type:	duration