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Common Stock - Schedule of Common Stock (Detail) (USD $) In Thousands, except Share data, unless otherwise specified | 0 Months Ended | 6 Months Ended |  | 9 Months Ended
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Jul. 02, 2014 | Sep. 30, 2014 | Dec. 31, 2013 | Sep. 30, 2014 Common stock [Member] | Sep. 30, 2014 Series B Pre-Funded Common Stock Warrants [Member] | Sep. 30, 2014 Series A Common Stock Warrants [Member] | Sep. 30, 2014 Series B Common Stock Warrants [Member]
Class of Warrant or Right [Line Items] |  |  |  |  |  |  |
Units Issued |  | 21,290,093 | 14,707,886 | 5,559,866 |  |  |
Warrants Issued |  |  |  |  | 1,340,538 | 2,779,933 | 670,269
Gross Proceeds | $ 24,000 |  |  | $ 14,084 | $ 3,387 | $ 5,261 | $ 1,268
Underwriting discount and offering expense | $ 1,600 | $ 100 |  | $ 885 | $ 213 | $ 428 | $ 103

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- Definition Number of securities into which the class of warrant or right may be converted. For example, but not limited to, 500,000 warrants may be converted into 1,000,000 shares. + 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)(2)) -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 -Subparagraph 2 -Article 4 + Details
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- Definition Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 30 -Article 5 + Details
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- Definition The cash outflow for cost incurred directly with the issuance of an equity security. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585 + Details
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