Net Loss per Share (Tables)

106 Months Ended

Jun. 30, 2012

Potential Dilutive Shares Excluded from Computation of Diluted Net Loss Per Share

Basic net loss per share is computed by dividing net loss by the weighted average number of shares of common stock outstanding for the period. The Company's potential dilutive shares, which include outstanding common stock options, unvested restricted stock and warrants, have not been included in the computation of diluted net loss per share for any of the periods presented as the result would be antidilutive. Such potential shares of common stock at June 30, 2012 and 2011 consist of the following:

	For the Six Months
	Ended June 30,
	2012		2011
Stock options		5,397,154		4,790,552
Unvested restricted common stock		1,029,848		248,752
Warrants		11,268,678		13,252,346
		17,695,680		18,291,650