DESCRIPTION OF BUSINESS (Details) - USD ($) $ in Thousands	9 Months Ended		12 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Cash and cash equivalents	$ 57,865		$ 50,422
Net working capital	50,300
Accumulated deficit	259,971		186,024
Negative cash flows from operating activities incurred	$ 23,716	$ 15,182	$ 22,800