STOCK-BASED COMPENSATION - Restricted Stock (Details)	6 Months Ended
	Jun. 30, 2020 $ / shares shares
Number of Units
Granted (in units) | shares	2,150,400
Non-vested at the end (in units) | shares	2,150,400
Weighted Average Grant Date Fair Value (Per Unit)
Granted (per unit) | $ / shares	$ 0.82
Outstanding at the end (per unit) | $ / shares	$ 0.82
Fair value of stock option grants
Weighted average expected life	6 years
Risk-free interest rate	0.43%
Expected volatility	41.04%
Expected dividend yield	0.00%
Stock Option
Fair value of stock option grants
Weighted average expected life	2 years 9 months 18 days
Risk-free interest rate	0.18%
Minimum expected volatility	83.00%
Maximum expected volatility	83.60%
Expected dividend yield	0.00%
2017 Omnibus Incentive Plan | Restricted Stock Units (RSUs)
Number of Units
Non-vested at the beginning (in units) | shares	1,180,882
Granted (in units) | shares	108,498
Vested (in units) | shares	(176,531)
Forfeited (in units) | shares	(46,348)
Non-vested at the end (in units) | shares	1,066,501
Weighted Average Grant Date Fair Value (Per Unit)
Outstanding at the beginning (per unit) | $ / shares	$ 5.44
Granted (per unit) | $ / shares	2.77
Vested (per unit) | $ / shares	7.91
Forfeited (per unit) | $ / shares	10.10
Outstanding at the end (per unit) | $ / shares	$ 4.55