Net loss per share

6 Months Ended

Jun. 30, 2016

Basic net loss per share is computed by dividing net loss by the weighted-average number of Common Stock actually outstanding during the period. Diluted net loss per share is computed by dividing net loss by the weighted-average number of Common Stock outstanding and dilutive potential Common Stock that would be issued upon the exercise of Common Stock warrants and options. For the three months ended June 30, 2016 and 2015 and the six months ended June 30, 2016 and 2015, the effect of issuing the potential common stock is anti-dilutive due to the net losses in those periods and the number of shares used to compute basic and diluted earnings per share are the same in each of those periods.

The following potentially dilutive securities outstanding have been excluded from the computations of diluted weighted-average shares outstanding because such securities have an antidilutive impact due to losses reported (in Common Stock equivalent shares):



	Three Months Ended June 30,		Six Months Ended June 30,
	2016	2015	2016	2015
Convertible preferred stock	4,205,405	—	4,505,405	—
Warrants issued to 2010/2012 convertible note holders to purchase common stock	480,147	—	480,147	480,147
Options to purchase common stock	3,036,979	1,533,618	3,036,979	1,727,471
Warrants issued in 2009 to purchase common stock	9,259	9,259	9,259	9,259
Warrants issued to underwriter to purchase common stock	82,500	82,500	82,500	82,500
Series A Warrants to purchase common stock	2,425,605	2,425,605	2,425,605	2,425,605
Series B Warrants to purchase common stock	—	1,614,200	—	1,614,200
Series C Warrants to purchase common stock	590,415	589,510	590,415	589,510
Series D Warrants to purchase common stock	2,810,812	—	2,810,812	—

Using the treasury stock method the following options and warrants were included in the calculation of fully diluted shares outstanding for the three months ended June 30, 2016 and 2015:



	Three Months Ended June 30,
	2016	2015
Warrants issued to 2010/2012 convertible note holders to purchase common stock	—	480,147
Options to purchase common stock	—	193,853