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REDEEMABLE NON-CONTROLLING INTERESTS (Details) $ in Thousands		3 Months Ended		9 Months Ended
	Jun. 12, 2019	Sep. 30, 2019 USD ($) Investor	Sep. 30, 2018 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2018 USD ($)
Change in Redeemable Noncontrolling Interests [Abstract]
Balance				$ 0
Increase in redeemable non-controlling interests due to issuance of common stock				27,264
Net income attributable to redeemable non-controlling interests		$ 307	$ 0	307	$ 0
Effect of foreign currency translation loss attributable to redeemable non-controlling interests				(683)
Balance		$ 26,888		$ 26,888
ACM Shanghai [Member]
Redeemable Noncontrolling Interest [Abstract]
Percentage of outstanding shares issued	4.20%	4.20%
Number of investors owned by employees entities | Investor		2
Percentage of discount on purchase price for employee entities		20.00%
Term of supplemental agreement		3 years

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The discount percentage of purchase price paid by employee entities.

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Term of supplement agreement with investors, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Change in noncontrolling interest during the period as a result of a change in the redemption value of redeemable noncontrolling interest.

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Amount of Net Income (Loss) attributable to redeemable noncontrolling interest.

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Amount of tax expense (benefit), after reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature, attributable to noncontrolling interests.

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