9. Net Loss per Common Share (Tables)

9 Months Ended

12 Months Ended

Sep. 30, 2013

Dec. 31, 2012

Notes to Financial Statements

Loss Per share computation

	Three Month Period Ended				Nine Month Period Ended
	September 30,				September 30,
	2013		2012		2013		2012
Basic and diluted weighted average common stock shares outstanding		70,106,312		69,679,854		70,005,207		69,679,854
Potentially dilutive securities excluded from loss per share computations:
Common stock options		19,743,747		20,248,227		19,743,747		20,248,227
Common stock purchase warrants		7,406,250		7,718,750		7,406,250		7,718,750

	2012		2011
Basic and diluted weighted average common stock shares outstanding		69,679,854		69,679,854
Potentially dilutive securities excluded from loss per share computations:
Common stock options		20,379,602		17,873,277
Common stock purchase warrants		7,718,750		6,218,750