STOCK-BASED COMPENSATION - Option Activity (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Shares
Vested and expected to vest (in shares)		2,066,529
Weighted Average Exercise Price
Vested and expected to vest (in dollars per share)		$ 10.23
Weighted Average Remaining Contractual Terms and Aggregate Intrinsic Value
Vested and expected to vest (in years)		8 years 6 months
Weighted average fair value option granted	$ 0.8	$ 2.1
2017 Omnibus Incentive Plan | Stock Option
Shares
Outstanding, at the beginning (in shares)	2,066,529	1,655,995
Granted (in shares)	631,136	491,095
Exercised (in shares)		(5,000)
Forfeited or expired (in shares)	(388,741)	(75,561)
Outstanding, at the end (in shares)	2,308,924	2,066,529	1,655,995
Exercisable at the end, Shares	648,331	323,737
Vested and expected to vest (in shares)	2,308,924
Weighted Average Exercise Price
Outstanding, at the beginning (in dollars per shares)	$ 10.23	$ 10.36
Granted (in dollars per shares)	3.20	9.81
Exercised (in dollars per shares)		9.98
Forfeited or expired (in dollars per shares)	9.73	10.46
Outstanding, at the end (in dollars per shares)	8.39	10.23	$ 10.36
Exercisable at the end (in dollars per shares)	10.35	$ 10.39
Vested and expected to vest (in dollars per share)	$ 8.39
Weighted Average Remaining Contractual Terms and Aggregate Intrinsic Value
Weighted Average Remaining Contractual Terms (Years)	8 years	8 years 6 months	9 years 3 months 18 days
Exercisable at the end, Weighted Average Remaining Contractual Terms (Years)	7 years 4 months 24 days	8 years 3 months 18 days
Vested and expected to vest (in years)	8 years
Aggregate Intrinsic Value, Outstanding, at the beginning (in dollars)		$ 6.5
Aggregate Intrinsic Value, Outstanding at the end (in dollars)	$ 0.2		$ 6.5
Vested and expected to vest (in dollars)	$ 0.2
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period	10 years