STOCK-BASED COMPENSATION - Options (Details) - 2017 Omnibus Incentive Plan - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Feb. 27, 2017
Stock options and restricted stock units granted under the 2017 Plan
Number of shares authorized				4,500,000
Stock option grants under the Plan
Vesting Period (in years)	5 years
Restricted stock unit grants under the Plan
Vesting Period (in years)	5 years
Director Group | Minimum
Stock option grants under the Plan
Vesting Period (in years)	1 year
Restricted stock unit grants under the Plan
Vesting Period (in years)	1 year
Director Group | Weighted average
Stock option grants under the Plan
Vesting Period (in years)	2 years
Restricted stock unit grants under the Plan
Vesting Period (in years)	2 years
Stock Option
Stock option grants under the Plan
# of Options Granted	631,136	491,095
Issued and Outstanding (in shares)	2,308,924	2,066,529	1,655,995
Weighted Average Exercise Price (in dollars per share)	$ 3.20	$ 9.81
Stock Option | Director Group
Stock option grants under the Plan
# of Options Granted	150,000
Issued and Outstanding (in shares)	100,000
Vesting Period (in years)	5 years
Weighted Average Exercise Price (in dollars per share)	$ 9.98
Weighted Average Grant Date Fair Value (in dollars)	$ 4.36
Restricted stock unit grants under the Plan
Vesting Period (in years)	5 years
Stock Option | Employee Group
Stock option grants under the Plan
# of Options Granted	2,632,730
Issued and Outstanding (in shares)	2,208,924
Weighted Average Exercise Price (in dollars per share)	$ 8.56
Weighted Average Grant Date Fair Value (in dollars)	$ 3.70
Stock Option | Employee Group | Minimum
Stock option grants under the Plan
Vesting Period (in years)	3 years
Restricted stock unit grants under the Plan
Vesting Period (in years)	3 years
Stock Option | Employee Group | Maximum
Stock option grants under the Plan
Vesting Period (in years)	5 years
Restricted stock unit grants under the Plan
Vesting Period (in years)	5 years
Director Group | Maximum
Stock option grants under the Plan
Vesting Period (in years)	5 years
Restricted stock unit grants under the Plan
Vesting Period (in years)	5 years
Restricted Stock Units (RSUs)
Restricted stock unit grants under the Plan
# of Restricted Stock Units Granted	753,986	592,015
Issued and outstanding	1,180,882	841,361	763,591
Restricted Stock Units (RSUs) | Director Group
Restricted stock unit grants under the Plan
# of Restricted Stock Units Granted	785,498
Issued and outstanding	730,838
Weighted Average Grant Date Fair Value	$ 2.75
Restricted Stock Units (RSUs) | Director Group | Minimum
Stock option grants under the Plan
Vesting Period (in years)	1 year
Restricted stock unit grants under the Plan
Vesting Period (in years)	1 year
Restricted Stock Units (RSUs) | Director Group | Maximum
Stock option grants under the Plan
Vesting Period (in years)	2 years
Restricted stock unit grants under the Plan
Vesting Period (in years)	2 years
Restricted Stock Units (RSUs) | Employee Group
Stock option grants under the Plan
Vesting Period (in years)	5 years
Restricted stock unit grants under the Plan
# of Restricted Stock Units Granted	1,568,655
Issued and outstanding	450,044
Vesting Period (in years)	5 years
Weighted Average Grant Date Fair Value	$ 10.59