Net Loss per Share (Tables)

6 Months Ended

Jun. 30, 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 June 30, 2013 and 2012 consist of the following:

	June 30,
	2013		2012
Stock options		6,538,419		5,397,154
Unvested restricted common stock		454,325		1,029,848
Warrants		10,441,431		11,268,678
		17,434,175		17,695,680