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Stockholders' Equity - Summary of Information About Warrants (Detail) | Jun. 30, 2013 | Jan. 31, 2013
--- | --- | ---
Class Of Warrant Or Right [Line Items] |  |
Exercise prices | 1.83 | 1.83
Number of Warrants | 6,055,535 |
Warrant 1 |  |
Class Of Warrant Or Right [Line Items] |  |
Exercise prices | 70.60 |
Number of Warrants | 94,897 |
Remaining Life in Years | 3 years 10 months 24 days |
Warrant 2 |  |
Class Of Warrant Or Right [Line Items] |  |
Exercise prices | 20.00 |
Number of Warrants | 386,400 |
Remaining Life in Years | 1 month 6 days |
Warrant 3 |  |
Class Of Warrant Or Right [Line Items] |  |
Exercise prices | 5.00 |
Number of Warrants | 1,155,023 |
Remaining Life in Years | 1 year 4 months 24 days |
Warrant 4 |  |
Class Of Warrant Or Right [Line Items] |  |
Exercise prices | 5.09 |
Number of Warrants | 461,024 |
Remaining Life in Years | 1 year 4 months 24 days |
Warrant 5 |  |
Class Of Warrant Or Right [Line Items] |  |
Exercise prices | 1.38 |
Number of Warrants | 322,150 |
Remaining Life in Years | 2 years 6 months |
Warrant 6 |  |
Class Of Warrant Or Right [Line Items] |  |
Exercise prices | 4.16 |
Number of Warrants | 1,000 |
Remaining Life in Years | 3 years 6 months |
Warrant 7 |  |
Class Of Warrant Or Right [Line Items] |  |
Exercise prices | 3.25 |
Number of Warrants | 1,695,654 |
Remaining Life in Years | 3 years 1 month 6 days |
Warrant 8 |  |
Class Of Warrant Or Right [Line Items] |  |
Exercise prices | 1.83 |
Number of Warrants | 987,543 |
Remaining Life in Years | 4 years 6 months |
Warrant 9 |  |
Class Of Warrant Or Right [Line Items] |  |
Exercise prices | 2.83 |
Number of Warrants | 79,013 |
Remaining Life in Years | 3 years 1 month 6 days |
Warrant 10 |  |
Class Of Warrant Or Right [Line Items] |  |
Exercise prices | 1.83 |
Number of Warrants | 833,530 |
Remaining Life in Years | 4 years 7 months 6 days |
Warrant 11 |  |
Class Of Warrant Or Right [Line Items] |  |
Exercise prices | 2.65 |
Number of Warrants | 39,301 |
Remaining Life in Years | 3 years 1 month 6 days |

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- Definition The exercise price of each class 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=6881521&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 4 -Article 4 + Details
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- Definition Aggregate amount of each class of warrants or rights outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 129 -Paragraph 4 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: 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=6881521&loc=d3e23780-122690 Reference 3: 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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