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Stockholders' Equity - Summary of Information About Warrants (Detail) | Dec. 31, 2012
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Class of Warrant or Right [Line Items] |
Exercise prices | 2.12
Number of Warrants | 5,138,195
Warrant 1 [Member] |
Class of Warrant or Right [Line Items] |
Exercise prices | 70.60
Number of Warrants | 94,897
Remaining Life in Years | 4 years 4 months 24 days
Warrant 2 [Member] |
Class of Warrant or Right [Line Items] |
Exercise prices | 20.00
Number of Warrants | 386,400
Remaining Life in Years | 7 months 6 days
Warrant 3 [Member] |
Class of Warrant or Right [Line Items] |
Exercise prices | 5.00
Number of Warrants | 1,155,023
Remaining Life in Years | 1 year 10 months 24 days
Warrant 4 [Member] |
Class of Warrant or Right [Line Items] |
Exercise prices | 5.09
Number of Warrants | 461,024
Remaining Life in Years | 1 year 10 months 24 days
Warrant 5 [Member] |
Class of Warrant or Right [Line Items] |
Exercise prices | 1.38
Number of Warrants | 322,150
Remaining Life in Years | 3 years
Warrant 6 [Member] |
Class of Warrant or Right [Line Items] |
Exercise prices | 4.16
Number of Warrants | 1,000
Remaining Life in Years | 4 years
Warrant 7 [Member] |
Class of Warrant or Right [Line Items] |
Exercise prices | 3.25
Number of Warrants | 1,695,654
Remaining Life in Years | 3 years 7 months 6 days
Warrant 8 [Member] |
Class of Warrant or Right [Line Items] |
Exercise prices | 2.20
Number of Warrants | 912,543
Remaining Life in Years | 5 years
Warrant 9 [Member] |
Class of Warrant or Right [Line Items] |
Exercise prices | 2.83
Number of Warrants | 109,505
Remaining Life in Years | 3 years 7 months 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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