Net Loss Per Share (Tables)

3 Months Ended

Mar. 31, 2013

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

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 anti-dilutive. Such potential shares of common stock at March 31, 2013 and 2012 consist of the following:

	For the Three Months Ended March 31,
	2013		2012
Stock options		6,743,835		5,179,253
Unvested restricted common stock		602,068		1,061,828
Warrants		11,148,139		11,657,741
		18,494,042		17,898,822