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UNAUDITED SUPPLEMENTARY QUARTERLY INFORMATION (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Net loss	$ (8,030)	$ (4,884)	$ (4,480)	$ (10,596)	$ (12,313)	$ (8,245)	$ (10,441)	$ (8,865)	$ (27,766)	$ (39,413)	$ (82,217)
Loss per common share (in dollars per share)	$ (0.11)	$ (0.07)	$ (0.06)	$ (0.15)	$ (0.19)	$ (0.14)	$ (0.20)	$ (0.19)	$ (0.39)	$ (0.70)	$ (2.46)
Basic and diluted weighted average number of common shares outstanding (in shares)	74,367,000	71,963,000	70,567,000	70,220,000	66,205,153,000	58,630,457,000	53,043,512,000	47,660,414,000	70,859,107	56,441,058	33,383,972

X

- Definition

The amount of net income (loss) from continuing operations per each basic and diluted share of common stock or unit when the per share amount is the same for both basic and diluted shares.

+ References

No definition available.

+ Details

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X

- Definition

Amount, after deduction of tax, noncontrolling interests, dividends on preferred stock and participating securities, and addition from assumption of issuance of common shares for dilutive potential common shares; of income (loss) available to common shareholders.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 45
-Paragraph 16
-URI http://asc.fasb.org/extlink&oid=96947427&loc=d3e1505-109256

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 45
-Paragraph 11
-URI http://asc.fasb.org/extlink&oid=96947427&loc=d3e1377-109256

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- References

No definition available.

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- Definition

Average number of shares or units issued and outstanding that are used in calculating basic and diluted earnings per share (EPS).

+ References

No definition available.

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