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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

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- 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 + Details
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