STOCKHOLDERS' EQUITY AND SHARE-BASED COMPENSATION, 2018 Omnibus Equity Compensation Plan (Details) - 2018 Equity Compensation Plan [Member]		3 Months Ended	9 Months Ended	12 Months Ended
	Jul. 26, 2018 shares	Sep. 30, 2019 USD ($) $ / shares shares	Sep. 30, 2019 USD ($) Installments $ / shares shares	Dec. 31, 2018 $ / shares shares
Share-based Compensation Arrangement [Abstract]
Shares reserved for issuance (in shares)	3,400,000
Stock Option [Member]
Share-based Compensation Arrangement [Abstract]
Number of equal installments for options vesting | Installments			4
Options vesting period			10 years
Share-based compensation expense | $		$ 600,000	$ 1,800,000
Options vested (in shares)		700,000	700,000
Unrecognized compensation expense | $		$ 7,900,000	$ 7,900,000
Weighted-average non-vested period			2 years 11 months 5 days
Number of Options [Roll Forward]
Outstanding, beginning balance (in shares)			2,881,219
Granted (in shares)	2,800,000		375,000
Exercised (in shares)			(6,250)
Forfeited (in shares)			(267,750)
Outstanding, ending balance (in shares)		2,982,219	2,982,219	2,881,219
Exercisable (in shares)		658,430	658,430
Weighted Average Exercise Price [Roll Forward]
Outstanding, beginning balance (in dollars per share) | $ / shares			$ 10.00
Granted (in dollars per share) | $ / shares			13.77
Exercised (in dollars per share) | $ / shares			9.91
Forfeited (in dollars per share) | $ / shares			10.28
Outstanding, beginning ending (in dollars per share) | $ / shares		$ 10.45	$ 10.45	$ 10.00
Weighted Average Remaining Contractual Term [Abstract]
Weighted average remaining contractual term			8 years 11 months 19 days	9 years 7 months 6 days
Weighted Average Grant Date Fair Value [Abstract]
Outstanding beginning balance (in dollars per share) | $ / shares			$ 3.47
Granted (in dollars per share) | $ / shares			4.37
Exercised (in dollars per share) | $ / shares			3.43
Forfeited (in dollars per share) | $ / shares			3.56
Outstanding (in dollars per share) | $ / shares		$ 3.57	$ 3.57	$ 3.47
Restricted Stock Units [Member]
Share-based Compensation Arrangement [Abstract]
Restricted stock units granted (in shares)	21,200
Options vesting period			1 year
Share-based compensation expense | $		$ 17,500	$ 122,500
Unrecognized compensation expense | $		$ 0	$ 0
Restricted stock units, forfeited (in shares)		0	0
Restricted stock units, vested (in shares)		21,200	21,200