ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES - Capital Raising Activities (Narrative) (Details) - USD ($)			3 Months Ended		6 Months Ended	8 Months Ended	12 Months Ended
	Mar. 05, 2021	Jan. 25, 2021	Mar. 31, 2021	Mar. 31, 2020	Aug. 03, 2020	Mar. 31, 2021	Dec. 31, 2020
Subsidiary, Sale of Stock [Line Items]
Proceeds From Issuance Of Common Stock, net of issuance costs			$ 96,908,000	$ 19,447,000
Stock Issued During Period, Value, New Issues			$ 96,908,000				$ 71,050,000
Total shares issued under distribution agreement			18,248,048,000				13,019,240
At the Market Offering Program [Member]
Subsidiary, Sale of Stock [Line Items]
Proceeds From Issuance Of Common Stock, net of issuance costs					$ 19,400,000	$ 53,200,000
Stock Issued During Period, Value, New Issues					$ 19,800,000	$ 54,100,000
Total shares issued under distribution agreement					3,170,727	10,156,561
At the Market Offering Program [Member] | Maximum [Member]
Subsidiary, Sale of Stock [Line Items]
Stock Issued During Period, Value, New Issues					$ 200,000,000	$ 150,000,000
Follow-on Offering [Member]
Subsidiary, Sale of Stock [Line Items]
Proceeds From Issuance Of Common Stock, net of issuance costs	$ 50,100,000	$ 45,200,000
Total shares issued under distribution agreement	9,200,000	8,740,000
Share Price	$ 5.45	$ 5.20
Firm Offering Member [Member]
Subsidiary, Sale of Stock [Line Items]
Total shares issued under distribution agreement	8,000,000	7,600,000
Over-Allotment Option [Member]
Subsidiary, Sale of Stock [Line Items]
Total shares issued under distribution agreement	1,200,000	1,140,000,000