STOCKHOLDERS' EQUITY (DEFICIT) - Equity Financing (Details) - USD ($) $ / shares in Units, $ in Millions	1 Months Ended		3 Months Ended			5 Months Ended	6 Months Ended
	Nov. 30, 2019	Jun. 30, 2019	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2019	Mar. 31, 2020	Jun. 30, 2020	Sep. 30, 2019
Class of Stock [Line Items]
Proceeds from sale of stock		$ 27.8
Sale of stock, shares issued (in shares)		20,400,000
Issuance of common stock, issuance costs			$ 0.1	$ 0.1	$ 2.2		$ 0.2
Number of warrants issued (in shares)								20,400,000
Combined purchase price (in dollars per share)								$ 1.47
Exercise price per warrant (in dollars per share)								$ 1.47
Warrants exercise period								1 year
ATM Facility
Class of Stock [Line Items]
Aggregate sales price	$ 35.0
Commission fixed rate	3.00%
Legal, accounting and printing costs						$ 0.2
Proceeds from sale of stock			$ 4.8				$ 8.0
Sale of stock, shares issued (in shares)			6,600,000				9,800,000
Stock price per share (in dollars per share)			$ 0.69				$ 0.75