DESCRIPTION OF BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Offerings (Details) - USD ($) $ in Millions	1 Months Ended
	Nov. 30, 2017	Jul. 31, 2017	Apr. 30, 2017	Sep. 30, 2016	Aug. 31, 2016
Private Placement
Other Disclosures
Net proceeds from the sale of common stock		$ 1.9	$ 4.4	$ 0.8	$ 1.3
Subsequent event | Public Offering
Other Disclosures
Net proceeds from the sale of common stock	$ 9.7