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Fair Value Measurement (Details) (Fair Value, Measurements [Member], USD $)	Sep. 30, 2012
Financial assets
Total financial assets	$ 21,463,358
Financial liabilities:
Total financial liabilities	14,864,398
Bond obligation [Member]
Financial liabilities:
Total financial liabilities	381,250
Warrant liabilities [Member]
Financial liabilities:
Total financial liabilities	14,483,148
Money market funds [Member] | Cash equivalents [Member]
Financial assets
Total financial assets	1,170,798
U.S. Treasury debt obligations [Member] | Cash equivalents [Member]
Financial assets
Total financial assets	14,260,825
Debt securities [Member] | Marketable securities [Member]
Financial assets
Total financial assets	6,031,735
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Financial assets
Total financial assets	15,431,623
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Money market funds [Member] | Cash equivalents [Member]
Financial assets
Total financial assets	1,170,798
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | U.S. Treasury debt obligations [Member] | Cash equivalents [Member]
Financial assets
Total financial assets	14,260,825
Significant Other Observable Inputs (Level 2) [Member]
Financial assets
Total financial assets	6,031,735
Financial liabilities:
Total financial liabilities	615,738
Significant Other Observable Inputs (Level 2) [Member] | Bond obligation [Member]
Financial liabilities:
Total financial liabilities	381,250
Significant Other Observable Inputs (Level 2) [Member] | Warrant liabilities [Member]
Financial liabilities:
Total financial liabilities	234,488
Significant Other Observable Inputs (Level 2) [Member] | Debt securities [Member] | Marketable securities [Member]
Financial assets
Total financial assets	6,031,735
Unobservable Inputs (Level 3) [Member]
Financial liabilities:
Total financial liabilities	14,248,660
Unobservable Inputs (Level 3) [Member] | Warrant liabilities [Member]
Financial liabilities:
Total financial liabilities	$ 14,248,660

X

- Definition

This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements.

+ 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=7578670&loc=d3e19207-110258

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Details

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

X

- Definition

This element represents the aggregate of the liabilities reported on the balance sheet at period end measured at fair value by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements.

+ 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=7578670&loc=d3e19207-110258

+ Details

Name:	us-gaap_LiabilitiesFairValueDisclosure
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Details

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