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Fair Value Measurement (Details 1) (USD $)	3 Months Ended
	Mar. 31, 2013
Roll forward for financial assets and liabilities measured at fair value using significant other observable inputs (Level 2)
Marketable debt securities, Beginning Balance	$ 14,339,896
Fair Value Measurement With Unobservable inputs reconciliation recurring basis asset transfers into level 1	(4,084,608)
Financial liabilities change included in earning fair value disclosure	(24,896)
Unrealized gain	1,439
Financial liabilities change settled in earning fair value disclosure	(50,000)
Marketable debt securities, ending Balance	10,181,831
Fair Value, Measurements [Member]
Roll forward for financial assets and liabilities measured at fair value using significant other observable inputs (Level 2)
Marketable debt securities, ending Balance	16,425,756
Fair Value, Measurements [Member] | Significant Other Observable Inputs (Level 2) [Member]
Roll forward for financial assets and liabilities measured at fair value using significant other observable inputs (Level 2)
Marketable debt securities, ending Balance	9,817,509
Marketable securities [Member] | Fair Value, Measurements [Member]
Roll forward for financial assets and liabilities measured at fair value using significant other observable inputs (Level 2)
Marketable debt securities, Beginning Balance	13,900,678
Fair Value Measurement With Unobservable inputs reconciliation recurring basis asset transfers into level 1	(4,084,608)
Unrealized gain	1,439
Marketable debt securities, ending Balance	9,817,509
Bond obligation [Member] | Fair Value, Measurements [Member]
Roll forward for financial assets and liabilities measured at fair value using significant other observable inputs (Level 2)
Marketable debt securities, Beginning Balance	331,250
Financial liabilities change settled in earning fair value disclosure	(50,000)
Marketable debt securities, ending Balance	281,250
Warrant liabilities [Member] | Fair Value, Measurements [Member]
Roll forward for financial assets and liabilities measured at fair value using significant other observable inputs (Level 2)
Marketable debt securities, Beginning Balance	107,968
Financial liabilities change included in earning fair value disclosure	(24,896)
Marketable debt securities, ending Balance	$ 83,072

X

- Details

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- Definition

Fair value measurement with directly or indirectly observable inputs reconciliation recurring basis liability gain loss included in earnings.

+ References

No definition available.

+ Details

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X

- Definition

Fair value measurement with directly or indirectly observable inputs reconciliation recurring basis liability settlements.

+ References

No definition available.

+ Details

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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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X

- Definition

Amount of transfers of assets measured on a recurring basis out of Level 2 of the fair value hierarchy into Level 1.

+ 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 (bb)

-URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258

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X

- Definition

The increase (decrease), resulting in a gain, in the difference between the fair value and the carrying value, or in the comparative fair values, of securities held at each balance sheet date, that was included in earnings for the period.

+ References

No definition available.

+ Details

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