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STOCK-BASED COMPENSATION AND EMPLOYEE BENEFIT PLANS (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended		6 Months Ended
	Jul. 31, 2019	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	May 03, 2018
Stock Options
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Share-based compensation expense (less than for ESPP)		$ 0.2	$ 0.3	$ 0.4	$ 0.6
Restricted Stock
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Share-based compensation expense (less than for ESPP)		$ 0.8	$ 0.8	$ 1.6	$ 1.0
Employee Stock Purchase Plan
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of shares available for grant (in shares)		1,310,802		1,310,802
The 2018 Plan
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of shares authorized (in shares)						16,406,939
Number of shares available for grant (in shares)		13,199,877		13,199,877		3,000,000
Subsequent Event \| Employee Stock Purchase Plan
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Stock issued during period, (in shares)	73,639