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Stockholders' Equity (Tables) | 12 Months Ended
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Dec. 31, 2014
Stockholders' Equity Note [Abstract] |
Summary of preferred stock authorized, issued and outstanding |
|  |  |  |  | Outstanding as of December 31,
| Authorized |  | Issued |  | 2014 |  | 2013
Series A Preferred Stock, par $0.001 | 1,000 |  |  | 817 |  |  | — |  |  | — |
Series B Preferred Stock, par $0.001 | 1,000 |  |  | 750 |  |  | — |  |  | — |
Series C Preferred Stock, par $0.001 | 1,091 |  |  | 1,091 |  |  | 23 |  |  | 26 |
Series D Preferred Stock, par $0.001 | 1,966,292 |  |  | 1,966,292 |  |  | — |  |  | — |
Summary of warrants outstanding | The following table summarizes the warrants outstanding as of December 31, 2014 and 2013:
|  |  |  |  |  | As of December 31, 2014 |  | As of December 31, 2013
Issued in Connection With: |  | Exercise Price |  | Expiration Date |  | Number of Warrants |  | Common Stock Warrant Liability |  | Number of Warrants |  | Common Stock Warrant Liability
March 2013 financing |  | $ | 3.17 |  |  | September 12, 2018 |  | 284,091 |  |  | $ | 2,022,729 |  |  | 755,681 |  |  | $ | 7,859,085 |
January 2011 financing |  | $ | 5.60 |  |  | January 27, 2016 |  | — |  |  | — |  |  | 1,673,750 |  |  | 11,381,498 |
July 2009 financing |  | $ | 13.52 |  |  | July 1, 2014 |  | — |  |  | — |  |  | 83,334 |  |  | 300,000 |
Warrants assumed in June 2009 Merger |  | $ 4.08 - 5.12 |  |  | August 1, 2015- April 28, 2016 |  | 727,969 |  |  | — |  |  | 1,002,052 |  |  | — |
Total |  |  |  |  |  | 1,012,060 |  |  | $ | 2,022,729 |  |  | 3,514,817 |  |  | $ | 19,540,583 |
Schedule of shares authorized under stock option plans, by exercise price range | The following table summarizes total stock options outstanding at December 31, 2014:
|  | Options Outstanding |  | Options Exercisable
Exercise Price |  | Options Outstanding |  | Weighted-Average Remaining Contractual Life (in Years) |  | Weighted Average Exercise Price |  | Options Exercisable |  | Weighted-Average Exercise Price
$0.00-$3.00 |  | 1,334,335 |  |  | 7.5 |  | $ | 2.21 |  |  | 846,872 |  |  | 2.24 |
$3.01-$6.00 |  | 1,625,862 |  |  | 3.2 |  | $ | 4.85 |  |  | 1,625,550 |  |  | 4.85 |
$6.01-$9.00 |  | 826,765 |  |  | 5.7 |  | $ | 7.08 |  |  | 641,781 |  |  | 6.58 |
$9.01-$12.00 |  | 184,839 |  |  | 6.5 |  | $ | 10.41 |  |  | 101,521 |  |  | 10.34 |
$12.01-$17.84 |  | 868,713 |  |  | 7.9 |  | $ | 13.08 |  |  | 330,124 |  |  | 13.29 |
|  | 4,840,514 |  |  | 5.8 |  | $ | 6.19 |  |  | 3,545,848 |  |  | 5.48 |
Schedule of stock options, activity | Stock option activity under our stock option plans was as follows:
| Number of Shares |  | Weighted-Average Exercise Price
Balance, December 31, 2013 | 4,134,591 |  |  | $ | 4.84 |
Granted | 1,140,859 |  |  | 11.52 |
Exercised | (294,442 | ) |  | 4.63 |
Cancelled | (140,494 | ) |  | 12.95 |
Balance, December 31, 2014 | 4,840,514 |  |  | $ | 6.19 |

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- Definition Tabular disclosure of option exercise prices, by grouped ranges, including the upper and lower limits of the price range, the number of shares under option, weighted average exercise price and remaining contractual option terms. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for share options (or share units) that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units that were granted, exercised or converted, forfeited, and expired during the year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of an entity's stock, including par or stated value per share, number and dollar amount of share subscriptions, shares authorized, shares issued, shares outstanding, number and dollar amount of shares held in an employee trust, dividend per share, total dividends, share conversion features, par value plus additional paid in capital, the value of treasury stock and other information necessary to a fair presentation, and EPS information. Stock by class includes common, convertible, and preferred stocks which are not redeemable or redeemable solely at the option of the issuer. Includes preferred stock with redemption features that are solely within the control of the issuer and mandatorily redeemable stock if redemption is required to occur only upon liquidation or termination of the reporting entity. If more than one issue is outstanding, state the title of each issue and the corresponding dollar amount; dollar amount of any shares subscribed but unissued and the deduction of subscriptions receivable there from; number of shares authorized, issued, and outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 480 -SubTopic 10 -Section S99 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=27011957&loc=d3e177068-122764 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21553-112644 Reference 3: 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.(d),(e)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.28,29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21538-112644 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21475-112644 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29 -Article 5 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21488-112644 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21484-112644 Reference 10: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 30 -Article 5 Reference 11: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21506-112644 Reference 12: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6403732&loc=d3e21300-112643 Reference 13: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 14: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21521-112644 + 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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