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Common Stock Warrants (Tables) | 6 Months Ended
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Jun. 30, 2018
Warrants And Rights Note Disclosure [Abstract] |
Summary of Common Stock Warrants Outstanding | As of June 30, 2018 and December 31, 2017, the following common stock warrants were outstanding:
|  |  |  |  |  | Exercise Price |  |  | June 30, |  |  | December 31, |
Issuance Date |  | Expiration Date |  | Balance Sheet Classification |  | per Share |  |  | 2018 |  |  | 2017 |
February 2015 |  | February 2020 |  | Stockholders' equity |  | $ | 66.20 |  |  |  | 9,063 |  |  |  | 9,063 |
February 2016 |  | February 2021 |  | Stockholders' equity |  | $ | 15.40 |  |  |  | 8,249 |  |  |  | 8,249 |
May 2018 |  | May 2028 |  | Stockholders' equity |  | $ | 23.69 |  |  |  | 6,332 |  |  |  | - |
|  |  |  |  |  |  |  |  |  |  | 23,644 |  |  |  | 17,312 |

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5047-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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 3: http://fasb.org/us-gaap/role/ref/legacyRef -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://fasb.org/us-gaap/role/ref/legacyRef -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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