Net Loss per Share

12 Months Ended

Dec. 31, 2015

11. Net Loss per Share

We compute basic loss per share by dividing net loss attributable to common stockholders by the weighted-average number of shares of common stock outstanding during the period. We have potentially dilutive securities outstanding that are not shown in a diluted loss per share calculation because their effect in both 2015 and 2014 would be anti-dilutive. These potentially dilutive securities include options, restricted stock units, and warrants and totaled 17,734,908 and 18,130,132 shares at December 31, 2015 and 2014, respectively.

The following table sets forth the anti-dilutive securities excluded from diluted loss per share:

	Years ended December 31,
	2015		2014
Anti-dilutive securities excluded from diluted loss per share:
Stock options		5,943,908		5,006,532
Restricted stock units		—		132,600
Warrants		11,791,000		12,991,000
Total anti-dilutive securities excluded from diluted loss per share		17,734,908		18,130,132