Net Loss per Share (Tables)

6 Months Ended

Jun. 30, 2015

Anti-Dilutive Securities Excluded from Net Loss per Share

The following items were excluded in the net loss per share calculation for the three and six months ended June 30, 2015 and 2014 because the inclusion of such items would have had an anti-dilutive effect:


	Three Months Ended June 30,				Six Months Ended June 30,
	2015		2014		2015		2014
Stock options		1,814,501		2,584,615		1,869,091		2,430,244
Restricted stock units		66,438		435,388		71,308		463,942
Warrants to purchase common stock		5,900,124		6,807,727		5,906,397		6,692,507
Convertible debt		5,643,806		4,951,459		5,556,658		4,416,222