8. Net Loss per Common Share (Tables)

3 Months Ended

Mar. 31, 2013

Notes to Financial Statements

Loss Per share computation

Basic weighted average common shares outstanding, and the potentially dilutive securities excluded from loss per share computations because they are anti-dilutive, are as follows as of March 31, 2013 and 2012, respectively:

	Three Month Period Ended March 31,
	2013		2012
Basic and diluted weighted average common stock shares outstanding		70,035,710		69,679,854
Potentially dilutive securities excluded from loss per share computations:
Common stock options		19,873,747		18,766,977
Common stock purchase warrants		7,718,750		6,218,750