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UNAUDITED SUPPLEMENTARY QUARTERLY INFORMATION (Tables) | 12 Months Ended
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Dec. 31, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract] |
Schedule of Earnings Per Share, Basic and Diluted | The following table summarizes unaudited supplementary quarterly information for the two years ended December 31, 2017, and 2016:
| Three months ended
| March 31, 2017 |  | June 30, 2017 |  | September 30, 2017 |  | December 31, 2017
| (unaudited) (in thousands, except share and per share amounts)
Net loss | $ | (10,596 | ) |  | $ | (4,480 | ) |  | $ | (4,884 | ) |  | $ | (8,030 | )
Net loss per share | $ | (0.15 | ) |  | $ | (0.06 | ) |  | $ | (0.07 | ) |  | $ | (0.11 | )
Weighted average shares outstanding Basic and Diluted | 70,220 |  |  | 70,567 |  |  | 71,963 |  |  | 74,367 |
| Three months ended
| March 31, 2016 |  | June 30, 2016 |  | September 30, 2016 |  | December 31, 2016
| (unaudited) (in thousands, except share and per share amounts)
Net loss | $ | (8,865 | ) |  | $ | (10,441 | ) |  | $ | (8,245 | ) |  | $ | (12,313 | )
Net loss per share | $ | (0.19 | ) |  | $ | (0.20 | ) |  | $ | (0.14 | ) |  | $ | (0.19 | )
Weighted average shares outstanding Basic and Diluted | 47,660,414 |  |  | 53,043,512 |  |  | 58,630,457 |  |  | 66,205,153 |

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- Definition Tabular disclosure of quarterly financial data. Includes, but is not limited to, financial information for fiscal quarters, cumulative effect of a change in accounting principle and earnings per share data. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a)-(j) -URI http://asc.fasb.org/extlink&oid=84173487&loc=d3e1280-108306 + Details
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