STOCK-BASED COMPENSATION AND EMPLOYEE BENEFIT PLANS - 401(k) Plan (Details) $ in Millions	12 Months Ended
Dec. 31, 2018 USD ($)
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Maximum annual deferral	100.00%
Matching contributions	$ 0.3

Maximum percentage of employee gross pay the employee may contribute to a defined contribution plan.

No definition available.

Name:	us-gaap_DefinedContributionPlanMaximumAnnualContributionsPerEmployeePercent
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration