Net Loss Per Share (Tables)

3 Months Ended

Mar. 31, 2015

Summary of Potentially Dilutive Shares of Common Stock

Because we reported a net loss for the three months ended March 31, 2015 and 2014, all potentially dilutive shares of common stock have been excluded from the computation of the dilutive net loss per share for all periods presented. As of March 31, 2015, none of the outstanding warrants were in-the-money and no material outstanding stock options were in-the-money, other than the options granted in the first quarter of 2015. Such potentially dilutive shares of common stock consist of the following:

	Three Months Ended March 31,
	2015		2014
Potentially dilutive securities, excluded:
Outstanding stock options		1,190,112		1,043,494
Unvested restricted stock units		627,024		610,700
Warrants to purchase common stock		9,371,002		9,380,127
		11,188,138		11,034,321