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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
	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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