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CAPITAL STOCK - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands		12 Months Ended
	Feb. 20, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Mar. 14, 2019
Class of Warrant or Right [Line Items]
Number of warrants outstanding (in shares)					2,328,925
At The Market Sale Of Stock
Class of Warrant or Right [Line Items]
Sale of Stock, Number of Shares Issued in Transaction		21,361,784	8,043,365	14,283,254
Sale of stock consideration received		$ 37,250	$ 19,680	$ 31,520
Public Offerings
Class of Warrant or Right [Line Items]
Sale of Stock, Number of Shares Issued in Transaction		19,891,709	3,199,866	7,576,288
Public Offering
Class of Warrant or Right [Line Items]
Sale of Stock, Price Per Share	$ 1.47
Sale of stock consideration received	$ 15,140

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Number of warrants or rights outstanding.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(i))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

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