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RELATED PARTY BALANCES AND TRANSACTIONS (Details) $ / shares in Units, ¥ in Thousands, $ in Thousands |  |  |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |  |  |
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Aug. 14, 2019 USD ($) $ / shares shares | Apr. 26, 2018 USD ($) | Apr. 26, 2018 CNY (¥) | Sep. 30, 2017 USD ($) shares | Mar. 14, 2017 USD ($) $ / shares shares | Aug. 31, 2019 $ / shares shares | Sep. 30, 2019 USD ($) | Sep. 30, 2018 USD ($) | Sep. 30, 2019 USD ($) | Sep. 30, 2018 USD ($) | Dec. 31, 2018 USD ($) | Apr. 26, 2018 CNY (¥) | Sep. 29, 2017 USD ($) | Aug. 18, 2017 USD ($) | Dec. 09, 2016 USD ($) | Dec. 09, 2016 CNY (¥)
Related Party Transaction [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares issued value |  |  |  |  |  |  | $ 26,463 |  | $ 26,463 |  |  |  |  |  |  |
Cancellation of options to acquire stock, amount |  |  |  |  |  |  | 576 |  | 576 |  |  |  |  |  |  |
Amount due to a related party |  |  |  |  |  |  | 1,990 |  | 1,990 |  | $ 0 |  |  |  |  |
Common Class A [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares issued (in shares) | shares |  |  |  |  |  | 2,053,572 |  |  |  |  |  |  |  |  |  |
Stock price (in dollars per share) | $ / shares |  |  |  |  |  | $ 14.00 |  |  |  |  |  |  |  |  |  |
ACM Shanghai [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount funded for leasehold improvements |  |  |  |  |  |  |  |  |  |  |  |  | $ 771 |  |  |
Monthly rental fee |  | $ 55 | ¥ 366 |  |  |  |  |  |  |  |  |  |  |  |  |
Security deposit amount |  | $ 163 |  |  |  |  |  |  |  |  |  | ¥ 1,077 |  |  |  |
Lease expense under lease agreement |  |  |  |  |  |  | 148 | $ 152 | $ 448 | $ 471 |  |  |  |  |  |
Ninebell Co., Ltd [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest-free loan to related party |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 946 |  |
Loans payable period |  |  |  |  |  |  |  |  | 180 days |  |  |  |  |  |  |
Loans extended period |  |  |  |  |  |  |  |  | 180 days |  |  |  |  |  |  |
Purchased materials amount |  |  |  |  |  |  | 2,591 | $ 2,529 | $ 7,395 | $ 5,364 |  |  |  |  |  |
Accounts payable-related party |  |  |  |  |  |  | 809 |  | 809 |  | 1,477 |  |  |  |  |
Prepaid for material purchases |  |  |  |  |  |  | 160 |  | 160 |  | 572 |  |  |  |  |
Shengyi Semiconductor Technology Co., Ltd [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchased materials amount |  |  |  |  |  |  | 261 |  | 453 |  |  |  |  |  |  |
Accounts payable-related party |  |  |  |  |  |  | 496 |  | 496 |  |  |  |  |  |  |
Shanghai Zhangjiang Group Co., Ltd. [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Lease expenses and payable for leasehold improvement due to a related party |  |  |  |  |  |  |  |  | 0 |  | $ 53 |  |  |  |  |
Shanghai Zhangjiang Group Co., Ltd. [Member] | Common Class A [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares issued (in shares) | shares |  |  |  | 787,098 |  |  |  |  |  |  |  |  |  |  |  |
Shares issued value |  |  |  | $ 5,903 |  |  |  |  |  |  |  |  |  |  |  |
SMC [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash delivered as of the close of business |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,981 | ¥ 20,124
Stock price (in dollars per share) | $ / shares |  |  |  |  | $ 7.50 |  |  |  |  |  |  |  |  |  |  |
Amount due to a related party |  |  |  |  |  |  | $ 1,990 |  | $ 1,990 |  |  |  |  |  |  |
SMC [Member] | Common Class A [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares issued (in shares) | shares |  |  |  |  | 397,502 |  |  |  |  |  |  |  |  |  |  |
Shares issued value |  |  |  |  | $ 2,981 |  |  |  |  |  |  |  |  |  |  |
Stock price (in dollars per share) | $ / shares | $ 13.195 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares surrender in exchange (in shares) | shares | 214,286 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cancellation of options to acquire shares (in shares) | shares | 53,571 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cancellation of options to acquire stock, amount | $ 3,403 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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