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Selected Quarterly Financial Data (Unaudited) (Tables) | 12 Months Ended
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Dec. 31, 2015
Quarterly Financial Information Disclosure [Abstract] |
Schedule of Quarterly Financial Information [Table Text Block] |
|  | Quarter Ended
|  | March 31, 2015 |  | June 30, 2015 |  | September 30, 2015 |  | December 31, 2015
Loss from operations |  | $ | (8,207 | ) |  | $ | (9,730 | ) |  | $ | (11,650 | ) |  | $ | (11,393 | )
Net loss |  | $ | (12,359 | ) |  | $ | (13,623 | ) |  | $ | (7,507 | ) |  | $ | (11,296 | )
Net loss per share – basic |  | $ | (0.17 | ) |  | $ | (0.19 | ) |  | $ | (0.08 | ) |  | $ | (0.12 | )
Net loss per share – dilutive |  | $ | (0.17 | ) |  | $ | (0.19 | ) |  | $ | (0.12 | ) |  | $ | (0.12 | )
Weighted average common share – basic |  |  | 72,673,959 |  |  |  | 72,736,829 |  |  |  | 85,974,751 |  |  |  | 90,810,629 |
Weighted average common share – dilutive |  |  | 72,673,959 |  |  |  | 72,736,829 |  |  |  | 87,585,103 |  |  |  | 90,810,629 |
|  | Quarter Ended
|  | March 31, 2014 |  | June 30, 2014 |  | September 30, 2014 |  | December 31, 2014
Loss from operations |  | $ | (3,839 | ) |  | $ | (4,651 | ) |  | $ | (4,911 | ) |  | $ | (7,101 | )
Net loss |  | $ | (3,838 | ) |  | $ | (4,556 | ) |  | $ | (4,910 | ) |  | $ | (6,480 | )
Net loss per share – basic and dilutive |  | $ | (0.07 | ) |  | $ | (0.08 | ) |  | $ | (0.08 | ) |  | $ | (0.10 | )
Weighted average common share – basic and dilutive |  |  | 58,324,260 |  |  |  | 58,543,528 |  |  |  | 58,543,528 |  |  |  | 65,483,336 |

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- Definition Tabular disclosure of the quarterly financial data in the annual financial statements. The disclosure includes financial information for each fiscal quarter for the current and previous year, including revenues, gross profit, income (loss) before extraordinary items and 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=51825399&loc=d3e1280-108306 + Details
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