STOCKHOLDERS' EQUITY - NARRATIVE (Details) - USD ($)			3 Months Ended			6 Months Ended	9 Months Ended
	Jul. 06, 2021	Feb. 11, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2020	Sep. 30, 2020	Oct. 24, 2014	Nov. 01, 2007
Equity, Class of Treasury Stock [Line Items]
Stock Issued During Period, Maximum Value Authorized For Issuance		$ 50,000,000
Sale of stock, number of shares issued in transaction (in shares)			1,900,000		3,300,000
Consideration received, net			$ 14,200,000		$ 35,900,000
Stock issuance costs				$ 1,200,000
Repurchased shares (in shares)						4,900,000
Repurchased shares, value						$ 30,600,000	$ 30,642,000
Stock repurchase program, average cost (in dollars per share)						$ 6.39
Equity Distribution Agreement
Equity, Class of Treasury Stock [Line Items]
Stock Issued During Period, Maximum Value Authorized For Issuance	$ 60,000,000	$ 250,000,000
Common Stock Issued, Commission Fee, Percentage	2.25%
Treasury Stock
Equity, Class of Treasury Stock [Line Items]
Repurchased shares (in shares)							4,932,977
Repurchased shares, value							$ 30,642,000
Stock Repurchase Program
Equity, Class of Treasury Stock [Line Items]
Stock repurchase program, authorized amount									$ 50,000,000
Stock repurchase program, additional authorized amount								$ 30,000,000