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Fair Value Measurement (Tables)

12 Months Ended

Dec. 31, 2013

Fair Value Disclosures [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, 2013
Financial assets
Cash equivalents:
Money market funds		$	821,335			$	—			$	—			$	821,335
U.S. Treasury debt obligations			28,408,808				—				—				28,408,808
Total financial assets		$	29,230,143			$	—			$	—			$	29,230,143
Financial liabilities
Bond obligation		$	—			$	125,000			$	—			$	125,000
Loan payable net of discounts			—				—				12,909,244				12,909,244
Warrant liabilities			—				—				5,541,810				5,541,810
Total financial liabilities		$	—			$	125,000			$	18,451,054			$	18,576,054

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 12/31/13 $
Marketable debt securities			13,900,678				(13,900,678	)			—				—				—
Bond obligation			331,250				—				—				(206,250	)			125,000
Warrant liabilities			107,968				—				(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 2013.

		Warrant Liabilities
Balance at December 31, 2012		$	9,157,397
Less fair value of warrants exercised			(470,303	)
Add change in fair value of warrants			(3,145,285	)
Balance at December 31, 2013		$	5,541,809

		Loan Payable
Balance at December 31, 2012		$	—
Add loan proceeds			13,820,264
Less discount			(487,576	)
Initial carrying value		$	13,332,688
Less repayments of principal			(620,215	)
Add accretion of discount			196,771
Balance at December 31, 2013		$	12,909,244
Current portion		$	3,664,370
Non-current portion			9,244,874
Balance at December 31, 2013		$	12,909,244

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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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