Total fund of the Partnership which was contributed by limited partners.

No definition available.

Name:	acmr_CapitalFundOfLimitedPartnership
Namespace Prefix:	acmr_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The market value of investments in trading equity securities and other forms of trading securities that provide ownership interests.

+ References

No definition available.

+ Details

Name:	acmr_DebtSecuritiesTradingSecuritiesEquity
Namespace Prefix:	acmr_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The amount of investment in partnership.

+ References

No definition available.

+ Details

Name:	acmr_InvestmentInPartnership
Namespace Prefix:	acmr_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The percentage ownership in Partnership's total subscribed capital.

+ References

No definition available.

+ Details

Name:	acmr_OwnershipPercentageInPartnership
Namespace Prefix:	acmr_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- References

No definition available.

+ Details

Name:	acmr_TradingSecuritiesListedInShanghaiStockExchangeAbstract
Namespace Prefix:	acmr_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of unrealized gain on investment in debt security measured at fair value with change in fair value recognized in net income (trading).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 9
-Subparagraph (e)
-URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27357-111563

+ Details

Name:	us-gaap_DebtSecuritiesTradingUnrealizedGain
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- References

No definition available.

+ Details

Name:	us-gaap_InvestmentsAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Amortized cost of investments in debt securities classified as trading.

+ References

No definition available.

+ Details

Name:	us-gaap_TradingSecuritiesDebtAmortizedCost
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=acmr_QingdaoFortuneTechXinxingCapitalPartnershipMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=acmr_SemiconductorManufacturingInternationalCorporationMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
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TRADING SECURITIES (Details) $ in Thousands, ¥ in Millions	3 Months Ended	9 Months Ended
TRADING SECURITIES (Details) $ in Thousands, ¥ in Millions	Sep. 30, 2020 USD ($)	Sep. 30, 2020 USD ($)	Jun. 18, 2020 USD ($)	Jun. 18, 2020 CNY (¥)	Dec. 31, 2019 USD ($)
Trading securities listed in Shanghai Stock Exchange [Abstract]
Cost	$ 14,680	$ 14,680			$ 0
Market value	23,888	23,888			$ 0
Unrealized gain on trading securities	$ 8,970	$ 8,970
Qingdao LP [Member]
Investments [Abstract]
Total capital fund of limited partnership			$ 315,000	¥ 2,224
Investment in partnership			$ 14,200	¥ 100
Ownership percentage in partnership			4.30%	4.30%
SMIC [Member] \| Minimum [Member]
Investments [Abstract]
Ownership percentage in partnership	30.00%	30.00%