SUBSEQUENT EVENTS - Narrative (Details) - Subsequent Event - Registered Direct Offering - USD ($) $ / shares in Units, $ in Millions	Feb. 12, 2021	Feb. 09, 2021
Subsequent events
Stock offering, shares sold (in shares)	35,000,000	22,600,000
Stock offering, purchase price (in dollars per share)	$ 0.98	$ 0.62
Stock offering, gross proceeds	$ 34.3	$ 14.0
Stock offering, net proceeds	$ 32.2	$ 13.1