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Stockholders’ Equity (Tables) | 12 Months Ended
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Dec. 31, 2013
Stockholders' Deficit [Abstract] |
Schedule of warrants to purchase shares of common stock [Table Text Block] | As of December 31, 2013, warrants to purchase shares of common stock consisted of the following (in thousands, except per share price):
|  |  |  |  |  |  | Outstanding at |
Date Issued |  | Expiration Date |  | Exercise Price |  | December 31, 2013 |
12/18/2009 |  | 12/18/2014 |  | $ | 2.13 |  |  | 42 |
04/13/2012 |  | 04/13/2018 |  | $ | 1.15 |  |  | 5,409 |
|  |  |  |  |  |  |  | 5,451 |
Schedule of common stock reserved for future issuance [Table Text Block] | As of December 31, 2013, shares of common stock reserved by us for future issuance consisted of the following (in thousands):
Stock options outstanding |  | 6,732 |
Shares issuable upon the exercise of warrants |  | 5,451 |
|  | 12,183 |

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- Definition Schedule of shares reserved for future issuance. + References No definition available. + Details
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- Definition Tabular disclosure of warrants or rights issued. Warrants and rights outstanding are derivative securities that give the holder the right to purchase securities (usually equity) from the issuer at a specific price within a certain time frame. Warrants are often included in a new debt issue to entice investors by a higher return potential. The main difference between warrants and call options is that warrants are issued and guaranteed by the company, whereas options are exchange instruments and are not issued by the company. Also, the lifetime of a warrant is often measured in years, while the lifetime of a typical option is measured in months. Disclose the title of issue of securities called for by warrants and rights outstanding, the aggregate amount of securities called for by warrants and rights outstanding, the date from which the warrants or rights are exercisable, and the price at which the warrant or right is exercisable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(i)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph i -Article 4 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 50 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6406099&loc=d3e25284-112666 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 50 -Section S99 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6784392&loc=d3e188667-122775 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 28 -Article 5 + Details
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