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Warrants (Schedule of Warrant Activity) (Detail) - shares shares in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2014 | Sep. 30, 2015
Class of Warrant or Right, Outstanding [Roll Forward] |  |
Warrants outstanding , Beginning balance |  | 8,540
Granted |  | 14,006
Class of Warrant or Right, Expired |  | 238
Warrants outstanding , Ending balance |  | 22,308
March 2015 Warrants [Member] |  |
Class of Warrant or Right, Outstanding [Roll Forward] |  |
Warrants outstanding , Beginning balance |  | 0
Granted |  | 14,006
Warrants outstanding , Ending balance |  | 14,006
Expiration |  | Mar. 18, 2020
September 2013 Warrant [Member] |  |
Class of Warrant or Right, Outstanding [Roll Forward] |  |
Warrants outstanding , Beginning balance |  | 3,973
Granted |  | 0
Warrants outstanding , Ending balance |  | 3,973
Expiration |  | Sep. 18, 2018
December 2012 Warrants [Member] |  |
Class of Warrant or Right, Outstanding [Roll Forward] |  |
Warrants outstanding , Beginning balance |  | 3,031
Granted |  | 0
Warrants outstanding , Ending balance |  | 3,031
Expiration |  | Dec. 31, 2017
April 2011 Warrants [Member] |  |
Class of Warrant or Right, Outstanding [Roll Forward] |  |
Warrants outstanding , Beginning balance |  | 615
Granted |  | 0
Warrants outstanding , Ending balance |  | 615
Expiration |  | Apr. 30, 2017
March 2011 Warrants [Member] |  |
Class of Warrant or Right, Outstanding [Roll Forward] |  |
Warrants outstanding , Beginning balance |  | 176
Granted |  | 0
Warrants outstanding , Ending balance |  | 176
Expiration |  | Mar. 31, 2016
March 2010 Warrants [Member] |  |
Class of Warrant or Right, Outstanding [Roll Forward] |  |
Warrants outstanding , Beginning balance |  | 25
Granted |  | 0
Warrants outstanding , Ending balance |  | 25
Expiration |  | Mar. 31, 2016
Consultant Warrants [Member] |  |
Class of Warrant or Right, Outstanding [Roll Forward] |  |
Warrants outstanding , Beginning balance |  | 720
Granted |  | 0
Class of Warrant or Right, Expired |  | 238
Warrants outstanding , Ending balance |  | 482
Consultant Warrants [Member] | Minimum [Member] |  |
Class of Warrant or Right, Outstanding [Roll Forward] |  |
Expiration | Dec. 31, 2014 |
Consultant Warrants [Member] | Maximum [Member] |  |
Class of Warrant or Right, Outstanding [Roll Forward] |  |
Expiration | Dec. 31, 2020 |

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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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph i -Article 4 + Details
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