Net Loss per Share

6 Months Ended

Jun. 30, 2011

Net Loss per Share [Abstract]

Net Loss per Share

7. Net Loss per Share

     Basic net loss per share is computed by dividing loss available to common stockholders (the numerator) by the weighted-average number of common shares outstanding (the denominator) for the period. The computation of diluted loss per share is similar to basic loss per share, except that the denominator is increased to include the number of additional common shares that would have been outstanding if the potentially dilutive common shares had been issued.

     The following potential common stock equivalents, as calculated using the treasury stock method, were not included in the computation of diluted net loss per share as their effect would have been anti-dilutive due to the net loss incurred (in thousands):

	Three Months Ended				Six Months Ended
	June 30,				June 30,
	2011		2010		2011		2010
Options to purchase common stock		3,171		2,895		3,405		2,554
Restricted stock		772		723		738		697
Warrants to purchase common stock		1,215		941		1,242		827
Total		5,158		4,559		5,385		4,078