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WARRANT LIABILITY (Details) - USD ($) $ in Thousands |  | 9 Months Ended
--- | --- | ---
Mar. 30, 2018 | Sep. 30, 2019
ACM Shanghai [Member] | Senior Secured Promissory Note [Member] |  |
Class of Stock [Line Items] |  |
Promissory note principal amount | $ 3,000 |
Interest rate on promissory note | 3.01% |
Promissory note maturity date |  | Aug. 17, 2023
SMC [Member] | Senior Secured Promissory Note [Member] |  |
Class of Stock [Line Items] |  |
Promissory note principal amount | $ 3,000 |
Interest rate on promissory note | 3.01% |
Promissory note maturity date |  | Aug. 17, 2023
Common Class A [Member] | SMC [Member] |  |
Class of Stock [Line Items] |  |
Exercise of common stock warrant issued (in shares) | 397,502 |

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