Net Loss Per Share

3 Months Ended

Mar. 31, 2015

Disclosure Potential Common Shares Excluded From Computation Of Diluted Net Loss Per Share [Abstract]

Net Loss Per Share

Net Loss Per Share

Basic net loss per share is computed by dividing net loss by the weighted average number of common shares outstanding for the period, excluding unvested restricted common shares. Diluted net loss per share is computed using the weighted average number of common shares outstanding and, when dilutive, potential common share equivalents from options, restricted stock units and warrants (using the treasury-stock method), and potential common shares from convertible securities (using the if-converted method). Because the Company reported a net loss for the three months ended March 31, 2015 and 2014, all potential common shares have been excluded from the computation of the diluted net loss per share for all periods presented, as the effect would have been anti-dilutive.

Potential dilutive common share equivalents consist of the following:

	Three Months Ended March 31,
	2015	2014
3.75% Convertible Senior Notes	—	5,487,642
2.00% Convertible Senior Notes	4,327,257	—
Unvested restricted stock units	961,947	1,024,695
Outstanding options	2,769,259	1,722,082
Total dilutive common shares	8,058,463	8,234,419