ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES - Capital Raising Activities (Narrative) (Details) - USD ($)	1 Months Ended	3 Months Ended		6 Months Ended		23 Months Ended
	Jul. 26, 2019	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019
Sale of Stock [Line Items]
Proceeds From Issuance Of Common Stock, net of issuance costs				$ 36,998,000	$ 0
Stock Issued During Period, Value, New Issues		$ 28,495,000	$ 8,503,000
At the Market Offering Program [Member]
Sale of Stock [Line Items]
Proceeds From Issuance Of Common Stock, net of issuance costs	$ 11,100,000,000					$ 112,000,000
Stock Issued During Period, Value, New Issues	$ 11,300,000,000					$ 113,700,000
Total shares issued under distribution agreement	1,771,301,000					13,351,877
At the Market Offering Program [Member] | Maximum [Member]
Sale of Stock [Line Items]
Stock Issued During Period, Value, New Issues						$ 125,000,000