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SHORT-TERM BORROWINGS (Details) ¥ in Thousands, $ in Thousands | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2021 USD ($) | Mar. 31, 2020 USD ($) | Mar. 31, 2021 CNY (¥) | Dec. 31, 2020 USD ($)
Short-Term Borrowings [Abstract] |  |  |  |  |
Short-term borrowings |  | $ 23,490 |  |  | $ 26,147
Interest expense related to short-term borrowings |  | 189 | $ 111 |  |
Line of Credit Due on April 1, 2021 [Member] |  |  |  |  |
Short-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 Borrowings [Abstract] |  |  |  |  |
Short-term borrowings | [1] | $ 1,370 |  |  | 1,380
Maximum borrowing capacity | ¥ |  |  |  | 80,000 |
Annual interest rate |  | 4.25% |  |  |
Line of credit due date |  | Jun. 27, 2021 |  |  |
Line of Credit Due on April 29, 2021 [Member] |  |  |  |  |
Short-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 Borrowings [Abstract] |  |  |  |  |
Short-term borrowings | [1] | $ 2,080 |  |  | 2,080
Maximum borrowing capacity | ¥ |  |  |  | 80,000 |
Annual interest rate |  | 2.70% |  |  |
Line of credit due date |  | Jun. 27, 2021 |  |  |
Line of Credit Due on September 30, 2021 [Member] |  |  |  |  |
Short-Term Borrowings [Abstract] |  |  |  |  |
Short-term borrowings | [1] | $ 2,855 |  |  | 0
Maximum borrowing capacity | ¥ |  |  |  | 80,000 |
Annual interest rate |  | 2.50% |  |  |
Line of credit due date |  | Sep. 30, 2021 |  |  |
Line of Credit Due on April 12, 2021 [Member] |  |  |  |  |
Short-Term Borrowings [Abstract] |  |  |  |  |
Short-term borrowings |  | $ 1,522 |  |  | 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 Borrowings [Abstract] |  |  |  |  |
Short-term borrowings |  | $ 1,522 |  |  | 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 Borrowings [Abstract] |  |  |  |  |
Short-term borrowings | [2] | $ 2,557 |  |  | 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 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 Borrowings [Abstract] |  |  |  |  |
Short-term borrowings | [2] | $ 2,442 |  |  | 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 Borrowings [Abstract] |  |  |  |  |
Short-term borrowings | [2] | $ 1,521 |  |  | 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 Borrowings [Abstract] |  |  |  |  |
Short-term borrowings | [2] | $ 1,837 |  |  | 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 Borrowings [Abstract] |  |  |  |  |
Short-term borrowings |  | $ 1,370 |  |  | 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 Borrowings [Abstract] |  |  |  |  |
Short-term borrowings |  | $ 3,044 |  |  | 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 February 1, 2022 [Member] |  |  |  |  |
Short-Term Borrowings [Abstract] |  |  |  |  |
Short-term borrowings |  | $ 1,370 |  |  | $ 0
Maximum borrowing capacity | ¥ |  |  |  | ¥ 80,000 |
Annual interest rate |  | 3.85% |  |  |
Line of credit due date |  | Feb. 01, 2022 |  |  |
[1] | Guaranteed by ACM’s Chief Executive Officer
[2] | Guaranteed by ACM’s Chief Executive Officer and CleanChip

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