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Fair Value Measurement (Tables)

12 Months Ended

Dec. 31, 2012

Fair Value Measurement [Abstract]

Financial assets and liabilities measured at fair value

The following table presents our financial assets and liabilities measured at fair value:

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

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 2012.

		Level 2 Beginning Balance 12/31/11 $				Net transfers (to) from Level 1 $				Change included in earnings $				Settled $				Level 2 Ending Balance 12/31/12 $
Marketable debt securities			3,280,591				10,620,087				—				—				13,900,678
Bond obligation			522,500				—				—				(191,250	)			331,250
Warrant liabilities			31,195				—				76,773				—				107,968

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 2012.

		Warrant Liabilities
Balance at December 31, 2011		$	6,011,120
Less fair value of warrants exercised			(4,435,957	)
Add fair value of warrants issued			1,714,436
Add change in fair value of warrants			5,867,798
Balance at December 31, 2012		$	9,157,397

X

- Definition

Fair value assets measured on recurring basis directly or indirectly observable input reconciliation.

+ 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 2

-Subparagraph (c)

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



Reference 2: 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=7578670&loc=d3e19279-110258



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 157

-Paragraph 32

-Subparagraph c

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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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=7578670&loc=d3e19190-110258

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