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Selected Quarterly Financial Data | 12 Months Ended
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Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract] |
Quarterly Financial Information [Text Block] | 11. Selected Quarterly Financial Data (Unaudited) (In thousands, except per share amounts)
|  | Quarter Ended |
|  | March 31, 2017 |  | June 30, 2017 |  | September 30, 2017 |  | December 31, 2017* |
Loss from operations |  | $ | (8,149) |  | $ | (6,475) |  | $ | (5,842) |  | $ | (5,783) |
Net (loss) income |  | $ | (3,058) |  | $ | (4,315) |  | $ | (10,930) |  | $ | 2,812 |
Net (loss) income per share – basic |  | $ | (0.02) |  | $ | (0.03) |  | $ | (0.14) |  | $ | 0.02 |
Net (loss) income per share – dilutive |  | $ | (0.02) |  | $ | (0.03) |  | $ | (0.14) |  | $ | 0.02 |
Weighted average common share – basic |  |  | 117,447,260 |  |  | 123,005,220 |  |  | 128,279,674 |  |  | 128,566,883 |
Weighted average common share – dilutive |  |  | 117,447,260 |  |  | 123,005,220 |  |  | 128,279,674 |  |  | 150,847,262 |
|  | Quarter Ended |
|  | March 31, 2016 |  | June 30, 2016 |  | September 30, 2016 |  | December 31, 2016 |
Loss from operations |  | $ | (10,581) |  | $ | (9,311) |  | $ | (9,156) |  | $ | (10,204) |
Net (loss) |  | $ | (11,078) |  | $ | (5,764) |  | $ | (8,489) |  | $ | (2,472) |
Net loss per share – basic |  | $ | (0.12) |  | $ | (0.06) |  | $ | (0.09) |  | $ | (0.02) |
Net loss per share – dilutive |  | $ | (0.12) |  | $ | (0.10) |  | $ | (0.09) |  | $ | (0.02) |
Weighted average common share – basic |  |  | 90,826,752 |  |  | 91,015,733 |  |  | 91,441,687 |  |  | 103,804,308 |
Weighted average common share – dilutive |  |  | 90,826,752 |  |  | 93,930,540 |  |  | 91,441,687 |  |  | 103,804,308 |
*Net Income due to gain on remeasurement of the warrant liabilities in excess of the quarter to date loss.

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- References No definition available. + Details
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- Definition The entire disclosure for quarterly financial data. Includes, but is not limited to, tabular presentation of financial information for fiscal quarters, effect of year-end adjustments, and an explanation of matters or transactions that affect comparability of the information. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -URI http://asc.fasb.org/topic&trid=2126967 + Details
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