Net Loss Per Share

3 Months Ended

Mar. 31, 2013

Net Loss Per Share

6. Net Loss Per Share

Basic and diluted net loss per share is computed by dividing the net loss by the weighted-average number of common shares outstanding during the period. The computation of net loss per share for each period, including the number of weighted-average shares outstanding, is shown on the face of the statements of comprehensive loss.

We have excluded the impact of common stock equivalents relating to shares underlying outstanding stock options and warrants from the calculation of diluted net loss per common share because all such securities are antidilutive for all periods presented.

The following table presents information on securities outstanding as of the end of each period that could potentially dilute the per share data in the future. All figures are in thousands.

	March 31,
	2013		2012
Stock options outstanding		14,141		10,338
Warrants outstanding		8,904		9,026
Total		23,045		19,364