Liability Attributable to Warrants (Tables)

6 Months Ended

Jun. 30, 2016

Other Liabilities Disclosure [Abstract]

Fair Value, Assets and Liabilities Measured on Nonrecurring Basis, Valuation Techniques

We used a binomial pricing model to determine the fair value of our warrants liability as of June 30, 2016 and December 31, 2015, the balance sheet dates, using the following assumptions:

	Estimated Volatility			Annualized Forfeiture Rate		Expected Term (Years)		Estimated Exercise Factor		Risk-Free Interest Rate			Dividends
2011 Transaction
June 30, 2016		108	%		—		0.18		1.2		0.26	%		—
December 31, 2015		132	%		—		0.68		3.5		0.43	%		—
ipCapital
June 30, 2016		125	%		—		0.29		1.2		0.26	%		—
December 31, 2015		127	%		—		0.79		4.0		0.54	%		—

Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation

The following table is a reconciliation of the warrants liability measured at fair value using significant unobservable inputs (Level 3) for the six months ended June 30, 2016:

Warrants liability – December 31, 2015 fair value	$	31,600
Change in fair value of warrant liability recorded in other expense		25,100
Change in fair value of warrant liability recorded in general and administrative expense		3,500
Warrants liability – June 30, 2016 fair value	$	60,200

Schedule of Stockholders' Equity Note, Warrants or Rights

The following tables reconcile the total number of warrants outstanding for the periods indicated:

	For the Three-Month Period Ended June 30, 2016
	Beginning Outstanding		Issued		Exercised		Cancelled / Forfeited		Ending Outstanding
2011 Transaction		686,833		—		—		—		686,833
2014 Transaction		376,667		—		—		—		376,667
Exercise Agreement		300,000		—		—		—		300,000
ipCapital		26,667		—		—		—		26,667
Consultant Warrant		11,285		—		—		—		11,285
Offer to Exercise		10,167		—		—		—		10,167
		1,411,619		—		—		—		1,411,619

	For the Three-Month Period Ended June 30, 2015
	Beginning Outstanding		Issued		Exercised		Cancelled / Forfeited		Ending Outstanding
2011 Transaction		686,833		—		—		—		686,833
2014 Transaction		376,667		—		—		—		376,667
ipCapital		300,000		—		—		—		300,000
Exercise Agreement		26,667		—		—		—		26,667
Consultant Warrant		11,285		—		—		—		11,285
Offer to Exercise		10,167		—		—		—		10,167
		1,411,619		—		—		—		1,411,619

	For the Six-Month Period Ended June 30, 2016
	Beginning Outstanding		Issued		Exercised		Cancelled / Forfeited		Ending Outstanding
2011 Transaction		686,833		—		—		—		686,833
2014 Transaction		376,667		—		—		—		376,667
Exercise Agreement		300,000		—		—		—		300,000
ipCapital		26,667		—		—		—		26,667
Consultant Warrant		11,285		—		—		—		11,285
Offer to Exercise		10,167		—		—		—		10,167
		1,411,619		—		—		—		1,411,619

	For the Six-Month Period Ended June 30, 2015
	Beginning Outstanding		Issued		Exercised		Cancelled / Forfeited		Ending Outstanding
2011 Transaction		686,833		—		—		—		686,833
2014 Transaction		376,667		—		—		—		376,667
Exercise Agreement		300,000		—		—		—		300,000
ipCapital		26,667		—		—		—		26,667
Consultant Warrant		11,285		—		—		—		11,285
Offer to Exercise		10,167		—		—		—		10,167
		1,411,619		—		—		—		1,411,619