Net Loss Per Share Applicable to Common Stockholders

6 Months Ended

Jun. 30, 2013

Earnings Per Share [Abstract]

Net Loss Per Share Applicable to Common Stockholders

9. Net Loss per Share Applicable to Common Stockholders

Basic net loss per share applicable to common stockholders is calculated by dividing net loss applicable to common stockholders by the weighted average shares outstanding during the period, without consideration for common stock equivalents. Net loss applicable to common stockholders is calculated by adjusting the net loss of the Company for cumulative preferred stock dividends. Diluted net loss per share applicable to common stockholders is calculated by adjusting weighted average shares outstanding for the dilutive effect of common stock equivalents outstanding for the period, determined using the treasury-stock method. For purposes of the dilutive net loss per share applicable to common stockholders calculation, preferred stock, stock options, and unvested restricted stock are considered to be common stock equivalents but are excluded from the calculation of diluted net loss per share applicable to common stockholders, as their effect would be anti-dilutive; therefore, basic and diluted net loss per share applicable to common stockholders were the same for all periods presented.

The following common stock equivalents were excluded from the calculation of diluted net loss per share applicable to common stockholders for the periods indicated because including them would have had an anti-dilutive effect. The convertible preferred stock numbers shown in the table are on a common stock equivalent basis as a result of the reverse stock split described in Note 1, Overview and Basis of Presentation.

	Three Months Ended June 30,				Six Months Ended June 30,
	2013		2012		2013		2012
Convertible preferred stock		19,731,564		19,731,564		19,731,564		19,731,564
Stock options		3,657,145		3,287,171		3,657,145		3,287,171
Unvested restricted stock		63,840		200,757		63,840		200,757
		23,452,549		23,219,492		23,452,549		23,219,492