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Warrants (Tables) | 6 Months Ended
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Jun. 30, 2015
Rollforward of Preferred Stock Warrants | The following represents a summary of the warrants outstanding at each of the dates identified:
|  |  |  |  |  |  |  |  |  | Number of Shares Underlying Warrants |
Warrants |  | Issue Date |  | Classification |  |  | Exercisable For |  |  | June 30, 2015 |  |  | December 31, 2014 |
Preferred Stock Warrants |  | Various |  |  | Liability |  |  |  | Preferred Stock |  |  |  | — |  |  |  | 14,544,247 |
Private Placement Warrants |  | June 15, 2015 |  |  | Equity |  |  |  | Common Stock |  |  |  | 3,190,030 |  |  |  | — |
Hercules Warrants |  | June 15, 2015 |  |  | Equity |  |  |  | Common Stock |  |  |  | 25,150 |  |  |  | — |
Warrants Assumed in Merger |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Series A Warrants |  | March - May 2015 |  |  | Equity |  |  |  | Common Stock |  |  |  | 1,219,000 |  |  |  | — |
Representative’s Warrants |  | March 2015 |  |  | Equity |  |  |  | Common Stock |  |  |  | 37,100 |  |  |  | — |
Underwriter’s Warrant |  | March 2015 |  |  | Equity |  |  |  | Common Stock |  |  |  | 2,160 |  |  |  | — |
Preferred Stock Warrants [Member] |
Rollforward of Preferred Stock Warrants | A rollforward of the Preferred Stock Warrants is as follows:
|  | Preferred Stock Warrants |  |  | Estimated Fair Value |
Balance—December 31, 2014 |  |  | 14,544,247 |  |  | $ | 1,309 |
Decrease in estimated fair value of warrants |  |  | — |  |  |  | (1,309 | )
Cancellation and gain (loss) on extinguishment |  |  | (14,544,247 | ) |  |  | — |
Balance—June 30, 2015 |  |  | — |  |  | $ | — |

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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 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 3: 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 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=51659978&loc=d3e25284-112666 Reference 5: 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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