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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Cash and Cash Equivalents (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025	Dec. 31, 2025
Cash and Cash Equivalent [Abstract]
Cash, cash equivalents and restricted cash and time deposits	$ 969,229		$ 969,229		$ 757,373
ACM Shanghai
Cash and Cash Equivalent [Abstract]
Cash payments for procurement of goods and services	191	$ 3,509	3,449	$ 6,183
United States
Cash and Cash Equivalent [Abstract]
Cash, cash equivalents and restricted cash and time deposits	314,256		314,256		107,184
Mainland China
Cash and Cash Equivalent [Abstract]
Cash, cash equivalents and restricted cash and time deposits	223,718		223,718		228,777
China Hong Kong
Cash and Cash Equivalent [Abstract]
Cash, cash equivalents and restricted cash and time deposits	427,310		427,310		421,104
South Korea
Cash and Cash Equivalent [Abstract]
Cash, cash equivalents and restricted cash and time deposits	2,674		2,674		241
Singapore
Cash and Cash Equivalent [Abstract]
Cash, cash equivalents and restricted cash and time deposits	$ 1,271		$ 1,271		$ 67

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- Definition

Amount of currency on hand as well as time deposits current and non current with banks or financial institutions.

+ References

No definition available.

+ Details

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- Definition

Cash payments to suppliers for goods and services provided and to employees for services provided.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 230
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 17
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482740/230-10-45-17

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 230
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 17
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482740/230-10-45-17

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 230
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 25
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482740/230-10-45-25

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