ACQUISITIONS AND DISPOSITIONS - Termination of Slan Agreements (Details) - License Agreement - Slan - USD ($) $ in Millions	Feb. 06, 2020	Nov. 07, 2017	Dec. 31, 2019
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
License fee received in cash		$ 5.0
Term of license agreement		10 years
Reimbursable development expenses			$ 2.0
Reimbursable development expenses, received	$ 2.0
Possible future payments to be received, based upon commercial sales, if circumstances met	$ 10.0