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Warrants (Tables) | 3 Months Ended
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Mar. 31, 2018
Common Stock [Member] |
Class Of Warrant Or Right [Line Items] |
Components of Warrants Outstanding | As of March 31, 2018, outstanding warrants to purchase common stock were:
|  | Classified as |  | Original Term |  | Exercise Price |  |  | Number of Shares Underlying Warrants |
Original issue date: |  |  |  |  |  |  |  |  |  |  |  |
August 2009 |  | Equity |  | 10 years |  | $ | 21.78 |  |  |  | 33,473 |
July 2010 |  | Equity |  | 9 years |  | $ | 21.78 |  |  |  | 6,694 |
August 2012 |  | Equity |  | 7 years |  | $ | 21.78 |  |  |  | 167,182 |
January 2015 |  | Equity |  | 5 years |  | $ | 6.96 |  |  |  | 34,483 |
April 2016 (a) |  | Liability |  | 7 years |  | $ | 1.12 |  |  |  | 904,800 |
April 2016 (b) |  | Liability |  | 5 years |  | $ | 1.12 |  |  |  | 146,100 |
June 2016 (c) |  | Liability |  | 7 years |  | $ | 4.00 |  |  |  | 1,002,507 |
March 2017 (d) |  | Equity |  | 5 years |  | $ | 4.67 |  |  |  | 1,338,326 |
|  |  |  |  |  |  |  |  |  |  | 3,633,565 |
(a) | Issued on April 14, 2016 in connection with the private placement to certain accredited investors. In accordance with the anti-dilution provisions, the exercise price of the warrants issued in connection with such private placement was adjusted from $4.98 to $4.00, which was the price paid by investors in the Company’s underwritten public offering of common stock, which closed on September 26, 2016. As a result of the issuance of 1,022,544 shares of the Company’s common stock at $1.12 in connection with the amendments to the Conditional Share Purchase Agreement, the exercise price was adjusted from $4.00 to $1.12, effective July 3, 2017.
(b) | Issued on April 14, 2016 in connection with the private placement to placement agents. As a result of the issuance of 1,022,544 shares of the Company’s common stock at $1.12 in connection with the amendments to the Conditional Share Purchase Agreement, the exercise price was adjusted from $3.99 to $1.12, effective July 3, 2017.
(c) | Issued on June 15, 2016 in connection with a subsequent private placement. In accordance with the anti-dilution provisions, the exercise price of the warrants issued in connection with the subsequent private placement was adjusted from $4.98 per share to $4.00 per share, which was the price paid by investors in the Company’s underwritten public offering of common stock, which closed on September 26, 2016. The exercise price remained at $4.00 as the anti-dilution provision was waived for the issuance of shares related to the July 3, 2017 amendment to the Conditional Share Purchase Agreements.
(d) | Issued on March 15, 2017 in connection with the JGB Debt. As a result of the issuance of 1,022,544 shares of the Company’s common stock at $1.12 in connection with the amendments to the Conditional Share Purchase Agreement, the number of shares issuable pursuant to the JGB Warrants increased from 1,250,000 to 1,296,679 and the exercise price of the JGB Warrants was adjusted from $5.00 to $4.82, effective July 3, 2017. As a result of the 2017 Public Offering, effective October 5, 2017, the aggregate number of shares of common stock issuable upon exercise of the JGB Warrants increased from 1,296,679 to 1,338,326 shares and the exercise price of the JGB Warrants decreased from $4.82 to $4.67 per share.

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + 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 FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=96867065&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=68057994&loc=d3e25284-112666 + Details
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