COMMON STOCK	9 Months Ended
Sep. 30, 2019
COMMON STOCK [Abstract]
COMMON STOCK	NOTE 13 – COMMON STOCK ACM is authorized to issue 50,000,000 shares of Class A common stock and 2,409,738 shares of Class B common stock, each with a par value of $0.0001. Each share of Class A common stock is entitled to one vote, and each share of Class B common stock is entitled to twenty votes and is convertible at any time into one share of Class A common stock. Shares of Class A common stock and Class B common stock are treated equally, identically and ratably with respect to any dividends declared by the Board of Directors unless the Board of Directors declares different dividends to the Class A common stock and Class B common stock by getting approval from a majority of common stockholders. On March 30, 2018, SMC exercised the SMC Warrant in full (note 12) to purchase 397,502 shares of Class A common stock. During the nine months ended September 30, 2019, ACM issued 193,642 shares of Class A common stock upon option exercises by employees and non-employees and an additional 35,815 shares of Class A common stock upon conversion of an equal number of shares of Class B common stock. In August 2019, ACM sold a total of 2,053,572 shares of Class A common stock to the public at a price of $14.00 per share for aggregate gross proceeds of $28,750. Net proceeds to ACM excluded an underwriting discount and offering expenses totaling $2,287. As mentioned in note 11, the shares repurchased from certain directors, employees and SMC upon the exercise of the underwriters’ over-allotment option in connection with the offering was for the purpose of share constructive retirement. A total of 214,286 repurchased shares were accounted for share retirement during the three and nine months ended September 30, 2019. There were issued and outstanding 16,179,058 shares of Class A common stock and 1,862,608 shares of Class B common stock at September 30, 2019 and 14,110,315 shares of Class A common stock and 1,898,423 shares of Class B common stock at December 31, 2018.

NOTE 13 – COMMON STOCK

ACM is authorized to issue 50,000,000 shares of Class A common stock and 2,409,738 shares of Class B common stock, each with a par value of $0.0001. Each share of Class A common stock is entitled to one vote, and each share of Class B common stock is entitled to twenty votes and is convertible at any time into one share of Class A common stock. Shares of Class A common stock and Class B common stock are treated equally, identically and ratably with respect to any dividends declared by the Board of Directors unless the Board of Directors declares different dividends to the Class A common stock and Class B common stock by getting approval from a majority of common stockholders.

On March 30, 2018, SMC exercised the SMC Warrant in full (note 12) to purchase 397,502 shares of Class A common stock.

During the nine months ended September 30, 2019, ACM issued 193,642 shares of Class A common stock upon option exercises by employees and non-employees and an additional 35,815 shares of Class A common stock upon conversion of an equal number of shares of Class B common stock.

In August 2019, ACM sold a total of 2,053,572 shares of Class A common stock to the public at a price of $14.00 per share for aggregate gross proceeds of $28,750. Net proceeds to ACM excluded an underwriting discount and offering expenses totaling $2,287. As mentioned in note 11, the shares repurchased from certain directors, employees and SMC upon the exercise of the underwriters’ over-allotment option in connection with the offering was for the purpose of share constructive retirement. A total of 214,286 repurchased shares were accounted for share retirement during the three and nine months ended September 30, 2019.

There were issued and outstanding 16,179,058 shares of Class A common stock and 1,862,608 shares of Class B common stock at September 30, 2019 and 14,110,315 shares of Class A common stock and 1,898,423 shares of Class B common stock at December 31, 2018.