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Fair Value Measurement (Details) (Fair Value, Measurements [Member], USD $)	Dec. 31, 2012
Financial assets
Total financial assets	$ 22,117,685
Financial liabilities:
Total financial liabilities	9,596,615
Bond obligation [Member]
Financial liabilities:
Total financial liabilities	331,250
Warrant liabilities [Member]
Financial liabilities:
Total financial liabilities	9,265,365
Money market funds [Member] | Cash equivalents [Member]
Financial assets
Total financial assets	521,075
U.S. Treasury debt obligations [Member] | Cash equivalents [Member]
Financial assets
Total financial assets	7,695,932
Debt securities [Member] | Marketable securities [Member]
Financial assets
Total financial assets	13,900,678
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Financial assets
Total financial assets	8,217,007
Financial liabilities:
Total financial liabilities
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Bond obligation [Member]
Financial liabilities:
Total financial liabilities
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Warrant liabilities [Member]
Financial liabilities:
Total financial liabilities
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Money market funds [Member] | Cash equivalents [Member]
Financial assets
Total financial assets	521,075
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	7,695,932
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Debt securities [Member] | Marketable securities [Member]
Financial assets
Total financial assets
Significant Other Observable Inputs (Level 2) [Member]
Financial assets
Total financial assets	13,900,678
Financial liabilities:
Total financial liabilities	439,218
Significant Other Observable Inputs (Level 2) [Member] | Bond obligation [Member]
Financial liabilities:
Total financial liabilities	331,250
Significant Other Observable Inputs (Level 2) [Member] | Warrant liabilities [Member]
Financial liabilities:
Total financial liabilities	107,968
Significant Other Observable Inputs (Level 2) [Member] | Money market funds [Member] | Cash equivalents [Member]
Financial assets
Total financial assets
Significant Other Observable Inputs (Level 2) [Member] | U.S. Treasury debt obligations [Member] | Cash equivalents [Member]
Financial assets
Total financial assets
Significant Other Observable Inputs (Level 2) [Member] | Debt securities [Member] | Marketable securities [Member]
Financial assets
Total financial assets	13,900,678
Unobservable Inputs (Level 3) [Member]
Financial assets
Total financial assets
Financial liabilities:
Total financial liabilities	9,157,397
Unobservable Inputs (Level 3) [Member] | Bond obligation [Member]
Financial liabilities:
Total financial liabilities
Unobservable Inputs (Level 3) [Member] | Warrant liabilities [Member]
Financial liabilities:
Total financial liabilities	9,157,397
Unobservable Inputs (Level 3) [Member] | Money market funds [Member] | Cash equivalents [Member]
Financial assets
Total financial assets
Unobservable Inputs (Level 3) [Member] | U.S. Treasury debt obligations [Member] | Cash equivalents [Member]
Financial assets
Total financial assets
Unobservable Inputs (Level 3) [Member] | Debt securities [Member] | Marketable securities [Member]
Financial assets
Total financial assets

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

Name:	us-gaap_AssetsFairValueDisclosure
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