STOCK-BASED COMPENSATION PLANS - Summary of our unvested stock options (Details) - Non vested Share Awards [Member] - $ / shares shares in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Non-vested Shares Under Option, Beginning Balance	569	658
Non-vested Shares Under Option, Granted	653	215
Non-vested Shares Under Option, Vested	(169)	(256)
Non-vested Shares Under Option, Forfeited	(163)	(48)
Non-vested Shares Under Option, Ending Balance	890	569
Weighted Average Grant Date Fair Value, Beginning Balance	$ 1.44	$ 0.81
Weighted Average Grant Date Fair Value, Granted	5.12	2.65
Weighted Average Grant Date Fair Value, Vested	1.24	0.72
Weighted Average Grant Date Fair Value, Forfeited	2.44	1.98
Weighted Average Grant Date Fair Value, Ending Balance	$ 4.03	$ 1.44