MEZZANINE EQUITY AND STOCKHOLDERS' EQUITY - Schedule of Changes in Number of Shares Outstanding (Details) - shares	6 Months Ended
	Jun. 30, 2018	Dec. 31, 2017
Shares issued:
Balance as of January 1	9,462,000
Issue of shares upon vesting of restricted stock units	208,000
Issue of shares on exercises of stock options	311,000
Issue of shares in the Exchange	812,000
Issue of shares on the conversion of the Series B preferred stock	4,492,000
Issue of shares on exercises of Series C warrants	310,000
Balance as of June 30	15,595,000
Shares held as treasury stock:
Balance as of January 1	38,024
Purchase of treasury stock	325,000
Balance as of June 30	363,361
Shares outstanding as of June 30	15,231,852	9,424,334