ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES - Capital Raising Activities (Narrative) (Details) - USD ($)		2 Months Ended	3 Months Ended		24 Months Ended
	Aug. 02, 2019	Mar. 31, 2020	Mar. 31, 2020	Mar. 31, 2019	Aug. 11, 2019
Subsidiary, Sale of Stock [Line Items]
Proceeds From Issuance Of Common Stock, net of issuance costs			$ 19,447,000	$ 8,503,000
Stock Issued During Period, Value, New Issues			$ 19,447,000	$ 8,503,000
Total shares issued under distribution agreement			3,171,000	1,268,000
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			$ 123,100,000
Stock Issued During Period, Value, New Issues		$ 19,800,000			$ 125,000,000
Total shares issued under distribution agreement		3,170,727			15,123,178
At the Market Offering Program [Member] | Maximum [Member]
Subsidiary, Sale of Stock [Line Items]
Stock Issued During Period, Value, New Issues		$ 200,000,000			$ 125,000,000
Follow-on Offering [Member]
Subsidiary, Sale of Stock [Line Items]
Proceeds From Issuance Of Common Stock, net of issuance costs	$ 45,900,000
Stock Issued During Period, Value, New Issues	$ 44,200,000
Total shares issued under distribution agreement	7,000,000