ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES - Capital Raising Activities (Narrative) (Details) - USD ($)				2 Months Ended	4 Months Ended	6 Months Ended	11 Months Ended	12 Months Ended			24 Months Ended
	Mar. 05, 2021	Jan. 25, 2021	Aug. 02, 2019	Dec. 31, 2021	Oct. 28, 2021	Aug. 03, 2020	Jun. 21, 2021	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Aug. 11, 2019
Subsidiary, Sale of Stock [Line Items]
Proceeds From Issuance Of Common Stock, net of issuance costs								$ 514,059,000	$ 71,050,000	$ 92,314,000
Stock Issued During Period, Value, New Issues								$ 514,059,000	$ 71,050,000	$ 92,314,000
Total shares issued under distribution agreement								100,828,173	13,019,240	14,377,000
At the Market Offering Program [Member]
Subsidiary, Sale of Stock [Line Items]
Proceeds From Issuance Of Common Stock, net of issuance costs				$ 77,000,000.0	$ 246,000,000.0	$ 19,400,000	$ 147,400,000				$ 123,100,000
Stock Issued During Period, Value, New Issues				$ 78,300,000	$ 250,000,000.0	$ 19,800,000	$ 150,000,000.0				$ 125,000,000.0
Total shares issued under distribution agreement				15,835,700	49,407,336	3,170,727	27,493,650				15,123,178
At the Market Offering Program [Member] | Maximum [Member]
Subsidiary, Sale of Stock [Line Items]
Stock Issued During Period, Value, New Issues				$ 250,000,000	$ 250,000,000	$ 200,000,000	$ 150,000,000				$ 125,000,000
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	$ 44,200,000
Total shares issued under distribution agreement	9,200,000	8,740,000,000	7,000,000
Share Price	$ 5.45	$ 5.20	$ 6.3535
Follow-on Offering [Member] | Maximum [Member]
Subsidiary, Sale of Stock [Line Items]
Share Price			$ 6.55
Firm Offering [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