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Common Stock Warrants - Summary of Common Stock Warrants Outstanding (Details) - $ / shares | 1 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Feb. 29, 2016 | Sep. 30, 2016 | Dec. 31, 2015
Class Of Warrant Or Right [Line Items] |  |  |
Expiration Date | 2021-02 |  |
Exercise price of warrants (in dollars per share) | $ 15.40 |  |
Warrant outstanding (in shares) |  | 916,547 | 908,298
Five Year Warrants Issued in December 2011 [Member] | Stockholders' Deficit [Member] |  |  |
Class Of Warrant Or Right [Line Items] |  |  |
Issuance Date |  | 2011-12 |
Expiration Date |  | 2016-12 |
Exercise price of warrants (in dollars per share) |  | $ 22.80 |
Warrant outstanding (in shares) |  | 13,158 | 13,158
Five Year Warrants Issued in March 2012 [Member] | Contingent Warrant Liabilities [Member] |  |  |
Class Of Warrant Or Right [Line Items] |  |  |
Issuance Date |  | 2012-03 |
Expiration Date |  | 2017-03 |
Exercise price of warrants (in dollars per share) |  | $ 35.20 |
Warrant outstanding (in shares) |  | 479,277 | 479,277
Five Year Warrants Issued in September 2012 [Member] | Stockholders' Deficit [Member] |  |  |
Class Of Warrant Or Right [Line Items] |  |  |
Issuance Date |  | 2012-09 |
Expiration Date |  | 2017-09 |
Exercise price of warrants (in dollars per share) |  | $ 70.80 |
Warrant outstanding (in shares) |  | 1,967 | 1,967
Two Year Warrants Issued in December 2014 [Member] | Contingent Warrant Liabilities [Member] |  |  |
Class Of Warrant Or Right [Line Items] |  |  |
Issuance Date |  | 2014-12 |
Expiration Date |  | 2016-12 |
Exercise price of warrants (in dollars per share) |  | $ 158.01 |
Warrant outstanding (in shares) |  | 404,833 | 404,833
Five Year Warrants Issued in February 2015 [Member] | Stockholders' Deficit [Member] |  |  |
Class Of Warrant Or Right [Line Items] |  |  |
Issuance Date |  | 2015-02 |
Expiration Date |  | 2020-02 |
Exercise price of warrants (in dollars per share) |  | $ 66.20 |
Warrant outstanding (in shares) |  | 9,063 | 9,063
Five Year Warrants Issued in February 2016 [Member] | Stockholders' Deficit [Member] |  |  |
Class Of Warrant Or Right [Line Items] |  |  |
Issuance Date |  | 2016-02 |
Expiration Date |  | 2021-02 |
Exercise price of warrants (in dollars per share) |  | $ 15.40 |
Warrant outstanding (in shares) |  | 8,249 |

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- Definition Exercise price per share or per unit of warrants or rights outstanding. + 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)(4)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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- Definition Number of warrants or rights outstanding. + 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 + Details
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