SUBSEQUENT EVENTS - Sale of Maine Facilities (Details) - Subsequent Event $ in Millions	Apr. 03, 2019 USD ($)
947 Waterford Road, LLC
Subsequent Event [Line Items]
Purchase price of sale leaseback	$ 1.0
Initial term of sale leaseback	120 months
300 Park Street, LLC
Subsequent Event [Line Items]
Purchase price of sale leaseback	$ 2.9
Initial term of sale leaseback	120 months
Oxford Lease
Subsequent Event [Line Items]
Initial term of sale leaseback	120 months
Minimum | 947 Waterford Road, LLC
Subsequent Event [Line Items]
Base rental payments of sale leaseback	$ 1.2
Minimum | 300 Park Street, LLC
Subsequent Event [Line Items]
Base rental payments of sale leaseback	3.3
Minimum | Oxford Lease
Subsequent Event [Line Items]
Base rental payments of sale leaseback	1.4
Maximum | 947 Waterford Road, LLC
Subsequent Event [Line Items]
Base rental payments of sale leaseback	1.3
Maximum | 300 Park Street, LLC
Subsequent Event [Line Items]
Base rental payments of sale leaseback	3.6
Maximum | Oxford Lease
Subsequent Event [Line Items]
Base rental payments of sale leaseback	$ 1.6