Net Loss Per Share (Tables)

3 Months Ended

Mar. 31, 2015

Reconciliation of Numerator and Denominator Used in Computing Basic and Diluted Net Loss per Share

The following table provides a reconciliation of the numerator and denominator used in computing basic and diluted net loss per share:

	For the 3-months ended March 31,
	2015			2014
Numerator:
Net loss	$	(4,088,134	)	$	(2,827,588	)
Accretion of stock issuance costs		(24,077	)		(22,481	)
Accretion of discount on Series E warrants		(87,470	)		(51,377	)
Series E and D, preferred stock dividends		(798,582	)		(740,637	)
Net loss attributable to common stockholders	$	(4,998,263	)	$	(3,642,083	)
Denominator:
Weighted-average common shares outstanding-basic and diluted		333,408			96,349

Outstanding Options, Warrants and Preferred Stock Excluded from Computation of Diluted Net Loss per Share

The following outstanding options, warrants and preferred stock were excluded from the computation of diluted net loss per share for the periods presented because their effect would have been anti-dilutive:

	March 31,		December 31,
	2015		2014
Options to purchase common stock		593,663		595,577
Convertible preferred stock (as converted)		2,127,463		2,126,982
Convertible preferred stock warrants (as converted)		136,908		50,681
Common stock warrant		931		931