REDEEMABLE PREFERRED STOCK - Series A Preferred Stock Narrative (Details) - USD ($)					1 Months Ended	3 Months Ended						9 Months Ended		48 Months Ended
	Jan. 15, 2021	Dec. 15, 2020	Nov. 16, 2020	Sep. 02, 2020	Feb. 29, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020
Class of Stock [Line Items]
Preferred stock redemption, trading days prior to redemption					20 days							20 days
Redeemable preferred stock dividends						$ 87,000			$ 0			$ 300,000	$ 0
Reclassification of Series A Preferred Stock from temporary equity to permanent equity						$ 10,747,000	$ 9,739,000	$ 6,948,000	$ 7,014,000	$ 10,825,000	$ 8,890,000	$ 27,434,000	$ 26,729,000	$ 92,387,000
Registration Statement
Class of Stock [Line Items]
Warrant right to purchase a share of common stock (in shares)						0.25						0.25		0.25
Series A Preferred Stock
Class of Stock [Line Items]
Cumulative dividend rate												5.50%
Preferred dividend per share per quarter (in usd per share)												$ 0.34375
Preferred dividends declared (in usd per share)				$ 0.34375
Preferred dividends paid, per share amount (in usd per share)						$ 0.34375	$ 0.34375	$ 0.68750	$ 0.34375	$ 0.34375	$ 0.34375
Series A Preferred Stock | Forecast
Class of Stock [Line Items]
Preferred dividends paid, per share amount (in usd per share)	$ 0.114583	$ 0.114583	$ 0.114583
Series A Preferred Stock | Registration Statement
Class of Stock [Line Items]
Preferred stock, par value (in usd per share)						0.001						0.001		$ 0.001
Preferred stock, stated value (in usd per share)						$ 25.00						$ 25.00		$ 25.00