Consolidated Statements of Cash Flows (Unaudited) (Parenthetical) $ in Thousands	9 Months Ended
Sep. 30, 2019 USD ($)
Cash flows from financing activities:
Direct issuance expenses	$ 2,287

This element represents the cash inflow from the net of direct expenses to the entity.

No definition available.

Name:	acmr_ProceedsFromIssuanceOfNetOfDirectExpenses
Namespace Prefix:	acmr_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration