ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES - Capital Raising Activities (Narrative) (Details) - USD ($)	1 Months Ended	3 Months Ended		20 Months Ended
	Apr. 26, 2019	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2019
Subsidiary, Sale of Stock [Line Items]
Proceeds From Issuance Of Common Stock, net of issuance costs		$ 8,503,000	$ 0
Stock Issued During Period, Value, New Issues		$ 8,503,000
At the Market Offering Program [Member]
Subsidiary, Sale of Stock [Line Items]
Proceeds From Issuance Of Common Stock, net of issuance costs	$ 5,700,000,000			$ 83,300,000
Stock Issued During Period, Value, New Issues	$ 5,800,000,000			$ 84,600,000
Total shares issued under distribution agreement	807,039,000			9,013,946
At the Market Offering Program [Member] | Maximum [Member]
Subsidiary, Sale of Stock [Line Items]
Stock Issued During Period, Value, New Issues				$ 125,000,000