Net loss per share

12 Months Ended

Dec. 31, 2018

Note 12. Net loss per share

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 years ended December 31, 2018 and 2017, 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).

	As of December 31,
	2018		2017
Convertible preferred stock		—		914,200
Warrants issued to 2010/2012 convertible note holders to purchase common stock		102,070		102,070
Options to purchase common stock		1,667,153		1,026,987
Warrants issued in 2009 to purchase common stock		1,851		1,851
Warrants issued to underwriter to purchase common stock		16,500		16,500
Series A warrants to purchase common stock		485,121		485,121
Series C warrants to purchase common stock		118,083		118,083
Series D warrants to purchase common stock		586,162		586,162
2017 PIPE warrants		6,024,425		6,024,425
2018 PIPE warrants		513,617		—
Total		9,514,982		9,275,399