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Fair Value Measurement (Tables)

9 Months Ended

Sep. 30, 2013

Fair Value Disclosures [Abstract]

Financial Assets and Liabilities Measured at Fair Value

The following table presents financial assets and liabilities measured at fair value as of September 30, 2013:

		Fair Value Measurement at Report Date Using
		Quoted Prices in Active Markets for Identical Assets (Level 1)				Significant Other Observable Inputs (Level 2)				Unobservable Inputs (Level 3)				As of September 30, 2013
Financial assets:
Cash equivalents:
Money market funds		$	377,695			$	—			$	—			$	377,695
U.S. Treasury debt obligations			20,577,598				—				—				20,577,598
Total financial assets		$	20,955,293			$	—			$	—			$	20,955,293
Financial liabilities:
Bond obligation		$	—			$	178,750			$	—			$	178,750
Loan payable net of discounts			—				—				13,468,348				13,468,348
Warrant liabilities			—				15,260				8,405,694				8,420,954
Total financial liabilities		$	—			$	194,010			$	21,874,042			$	22,068,052

Roll Forward for Financial Assets and Liabilities Measured at Fair Value Using Significant Other Observable Inputs (Level 2)

Level 2 Reconciliation

The following table presents a roll forward for financial assets and liabilities measured at fair value using significant other observable inputs (Level 2) for 2013:

		Level 2 Beginning Balance 12/31/12 $				Net transfers (to) from Level 1 $				Change included in earnings $				Settled $				Level 2 Ending Balance 09/30/13 $
Marketable securities			13,900,678				(13,900,678	)			—				—				—
Bond obligation			331,250				—				—				(152,500	)			178,750
Warrant liabilities			107,968				—				(92,708	)			—				15,260

Roll Forward for Liabilities Measured at Fair Value Using Significant Unobservable Inputs (Level 3)

Level 3 Reconciliation

The following table presents a roll forward for liabilities measured at fair value using significant unobservable inputs (Level 3) for 2013.

		Warrant Liabilities
Balance at December 31, 2012		$	9,157,397
Less fair value of warrants exercised			(418,841	)
Add change in fair value of warrants			(332,862	)
Balance at September 30, 2013		$	8,405,694

		Loan payable net of discounts
Loan proceeds		$	13,820,264
Less discount			(487,576	)
Add amortization of discount			135,660
Balance at September 30, 2013		$	13,468,348

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- Definition

Fair Value Assets Measured On Recurring Basis Directly Or Indirectly Observable Input Reconciliation Table [Text Block]

+ References

No definition available.

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- Definition

Tabular disclosure of the fair value measurement of liabilities using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes attributable to the following: (1) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets), and gains or losses recognized in other comprehensive income (loss) and a description of where those gains or losses included in earnings (or changes in net assets) are reported in the statement of income (or activities); (2) purchases, sales, issues, and settlements (each type disclosed separately); and (3) transfers in and transfers out of Level 3 (for example, transfers due to changes in the observability of significant inputs) by class of liability.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 3

-URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19279-110258



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)

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

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- Definition

Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3).

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19190-110258

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