SHORT-TERM BORROWINGS (Details) ¥ in Thousands, $ in Thousands		12 Months Ended
		Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2021 CNY (¥)
Short-Term and Long-term Borrowings [Abstract]
Short-term borrowings		$ 9,591	$ 26,147
Interest expense related to short-term borrowings		700	897	$ 745
Line of Credit Due on April 1, 2021 [Member]
Short-Term and Long-term Borrowings [Abstract]
Short-term borrowings	[1]	$ 0	4,599
Maximum borrowing capacity | ¥					¥ 80,000
Annual interest rate		4.70%
Line of credit due date		Mar. 23, 2021
Line of Credit Due on June 27, 2021 [Member]
Short-Term and Long-term Borrowings [Abstract]
Short-term borrowings	[1]	$ 0	1,380
Maximum borrowing capacity | ¥					80,000
Annual interest rate		4.25%
Line of credit due date		Jun. 28, 2021
Line of Credit Due on April 29, 2021 [Member]
Short-Term and Long-term Borrowings [Abstract]
Short-term borrowings	[1]	$ 0	820
Maximum borrowing capacity | ¥					80,000
Annual interest rate		2.80%
Line of credit due date		Mar. 23, 2021
Line of Credit Due on June 27, 2021 [Member]
Short-Term and Long-term Borrowings [Abstract]
Short-term borrowings	[1]	$ 0	2,080
Maximum borrowing capacity | ¥					80,000
Annual interest rate		2.70%
Line of credit due date		Jun. 25, 2021
Line of Credit Due on April 12, 2021 [Member]
Short-Term and Long-term Borrowings [Abstract]
Short-term borrowings		$ 0	1,533
Maximum borrowing capacity | ¥					20,000
Annual interest rate		4.65%
Line of credit due date		Apr. 12, 2021
Line of Credit Due on May 24, 2021 [Member]
Short-Term and Long-term Borrowings [Abstract]
Short-term borrowings		$ 0	1,533
Maximum borrowing capacity | ¥					20,000
Annual interest rate		3.65%
Line of credit due date		May 24, 2021
Line of Credit Due on May 27, 2021 [Member]
Short-Term and Long-term Borrowings [Abstract]
Short-term borrowings	[2]	$ 0	2,575
Maximum borrowing capacity | ¥					70,000
Annual interest rate		4.68%
Line of credit due date		May 27, 2021
Line of Credit Due on June 27, 2021 [Member]
Short-Term and Long-term Borrowings [Abstract]
Short-term borrowings	[2]	$ 0	1,380
Maximum borrowing capacity | ¥					70,000
Annual interest rate		4.68%
Line of credit due date		Mar. 29, 2021
Line of Credit Due on May 28, 2021 [Member]
Short-Term and Long-term Borrowings [Abstract]
Short-term borrowings	[2]	$ 0	2,442
Maximum borrowing capacity | ¥					70,000
Annual interest rate		3.48%
Line of credit due date		May 28, 2021
Line of Credit Due on June 7, 2021 [Member]
Short-Term and Long-term Borrowings [Abstract]
Short-term borrowings	[2]	$ 0	1,521
Maximum borrowing capacity | ¥					70,000
Annual interest rate		3.50%
Line of credit due date		Jun. 07, 2021
Line of Credit Due on June 16, 2021 [Member]
Short-Term and Long-term Borrowings [Abstract]
Short-term borrowings	[2]	$ 0	1,838
Maximum borrowing capacity | ¥					70,000
Annual interest rate		3.50%
Line of credit due date		Jun. 16, 2021
Line of Credit Due on August 10, 2021 [Member]
Short-Term and Long-term Borrowings [Abstract]
Short-term borrowings		$ 0	1,380
Maximum borrowing capacity | ¥					80,000
Annual interest rate		3.85%
Line of credit due date		Aug. 10, 2021
Line of Credit Due on August 25, 2021 [Member]
Short-Term and Long-term Borrowings [Abstract]
Short-term borrowings		$ 0	3,066
Maximum borrowing capacity | ¥					80,000
Annual interest rate		3.85%
Line of credit due date		Aug. 25, 2021
Line of Credit Due on June 7, 2022 [Member]
Short-Term and Long-term Borrowings [Abstract]
Short-term borrowings	[3]	$ 4,616	0
Maximum borrowing capacity | ¥					100,000
Annual interest rate		2.70%
Line of credit due date		Jun. 07, 2022
Line of Credit Due on October 21, 2022 [Member]
Short-Term and Long-term Borrowings [Abstract]
Short-term borrowings		$ 3,407	0
Maximum borrowing capacity | ¥					150,000
Annual interest rate		1.95%
Line of credit due date		Oct. 21, 2022
Line of Credit Due on October 25, 2022 [Member]
Short-Term and Long-term Borrowings [Abstract]
Short-term borrowings		$ 1,568	$ 0
Maximum borrowing capacity | ¥					¥ 60,000
Annual interest rate		3.85%
Line of credit due date		Oct. 25, 2022

[1] guaranteed by ACM’s Chief Executive Officer

[2] guaranteed by ACM’s Chief Executive Officer and Cleanchip Technologies Limited

[3] guaranteed by Cleanchip Technologies Limited