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Warrant Liability - Summary of Outstanding Warrants and Fair Value of Warrant Liability (Detail) (USD $)	Sep. 30, 2013
Class of Warrant or Right [Line Items]
Number Outstanding	9,601,378
Series A Warrants [Member]
Class of Warrant or Right [Line Items]
Number Outstanding	8,166,895
Exercise Price per share	1.40
November 2008 Financing [Member]
Class of Warrant or Right [Line Items]
Number Outstanding	1,034,483
Exercise Price per share	23.00
November 2009 Financing [Member]
Class of Warrant or Right [Line Items]
Number Outstanding	400,000
Exercise Price per share	15.00
Warrant liabilities [Member]
Class of Warrant or Right [Line Items]
Fair Value	$ 8,420,954
Warrant liabilities [Member] | Series A Warrants [Member]
Class of Warrant or Right [Line Items]
Fair Value	8,405,694
Warrant liabilities [Member] | November 2008 Financing [Member]
Class of Warrant or Right [Line Items]
Fair Value
Warrant liabilities [Member] | November 2009 Financing [Member]
Class of Warrant or Right [Line Items]
Fair Value	$ 15,260

X

- 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



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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Namespace Prefix:	us-gaap_
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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- 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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Namespace Prefix:	us-gaap_
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Balance Type:	na
Period Type:	instant

X

- Definition

Fair value of financial and nonfinancial obligations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258

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