COMMITMENTS AND CONTINGENCIES - Purchase and Other Commitments (Details) - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018
Commitments and Contingencies Disclosure [Abstract]
Non-cancelable purchase orders related to consulting services	$ 5.3	$ 6.0

Minimum amount of purchase arrangement in which the entity has agreed to expend funds to procure goods or services from a supplier.

No definition available.