STOCKHOLDER'S EQUITY AND SHARE-BASED COMPENSATION, 2018 Omnibus Equity Compensation Plan (Details) - 2018 Equity Compensation Plan [Member] $ / shares in Units, $ in Thousands		3 Months Ended	12 Months Ended
	Jul. 26, 2018 shares	Mar. 31, 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
Options vested (in shares)		0
Option exercisable (in shares)		0
Unrecognized compensation expense | $		$ 8,200
Weighted-average non-vested period		3 years 4 months 10 days
Number of Options [Roll Forward]
Outstanding, beginning balance (in shares)		2,881,219
Granted (in shares)	2,800,000	45,000
Exercised (in shares)		0
Forfeited (in shares)		(95,000)
Expired (in shares)		0
Outstanding, ending balance (in shares)		2,831,219	2,881,219
Weighted Average Exercise Price [Roll Forward]
Outstanding, beginning balance (in dollars per share) | $ / shares		$ 10.00
Granted (in dollars per share) | $ / shares		11.01
Exercised (in dollars per share) | $ / shares		0
Forfeited (in dollars per share) | $ / shares		9.91
Expired (in dollars per share) | $ / shares		0
Outstanding, beginning ending (in dollars per share) | $ / shares		$ 10.02	$ 10.00
Weighted Average Remaining Contractual Term [Abstract]
Weighted average remaining contractual term		9 years 4 months 10 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		3.71
Forfeited (in dollars per share) | $ / shares		3.43
Outstanding (in dollars per share) | $ / shares		$ 3.47	$ 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 | $		$ 53
Unrecognized compensation expense | $		$ 70
Restricted stock units, forfeited (in shares)		0
Restricted stock units, vested (in shares)		0