ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES - Capital Raising Activities (Narrative) (Details) - USD ($)					3 Months Ended			6 Months Ended			11 Months Ended	12 Months Ended
	Jul. 30, 2021	Jun. 30, 2021	Mar. 05, 2021	Jan. 25, 2021	Jun. 30, 2021	Mar. 31, 2021	Mar. 31, 2020	Jun. 30, 2021	Aug. 03, 2020	Jun. 30, 2020	Jun. 21, 2021	Dec. 31, 2020
Subsidiary, Sale of Stock [Line Items]
Proceeds From Issuance Of Common Stock, net of issuance costs								$ 221,654,000		$ 19,447,000
Stock Issued During Period, Value, New Issues					$ 124,746,000	$ 96,908,000	$ 19,447,000	$ 221,654,000				$ 71,050,000
Total shares issued under distribution agreement					23,087,000	18,248,000	3,171,000	41,335,137				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	$ 28,200,000	$ 30,600,000							$ 19,400,000		$ 147,400,000
Stock Issued During Period, Value, New Issues	$ 28,600,000	$ 31,100,000							$ 19,800,000		$ 150,000,000.0
Total shares issued under distribution agreement	5,560,000	5,750,000							3,170,727		27,493,650
At the Market Offering Program [Member] | Maximum [Member]
Subsidiary, Sale of Stock [Line Items]
Stock Issued During Period, Value, New Issues		$ 250,000,000							$ 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			$ 50,000,000.0	$ 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