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Common Stock Warrants - Summary of Common Stock Warrants Outstanding (Details) - $ / shares shares in Thousands | 6 Months Ended |  |
--- | --- | --- | ---
Jun. 30, 2016 | Feb. 29, 2016 | Dec. 31, 2015
Class Of Warrant Or Right [Line Items] |  |  |
Exercise price of warrants (in dollars per share) |  | $ 0.77 |
Warrant outstanding (in shares) | 18,330 |  | 18,165
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) | $ 1.14 |  |
Warrant outstanding (in shares) | 263 |  | 263
Five Year Warrants Issued in March 2012 [Member] | 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) | $ 1.76 |  |
Warrant outstanding (in shares) | 9,585 |  | 9,585
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) | $ 3.54 |  |
Warrant outstanding (in shares) | 39 |  | 39
Two Year Warrants Issued in December 2014 [Member] | 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) | $ 7.90 |  |
Warrant outstanding (in shares) | 8,097 |  | 8,097
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) | $ 3.31 |  |
Warrant outstanding (in shares) | 181 |  | 181
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) | $ 0.77 |  |
Warrant outstanding (in shares) | 165 |  |

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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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