Basis of Presentation and Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2012

Basis of Presentation and Significant Accounting Policies [Abstract]

Outstanding securities considered anti-dilutive

Potentially dilutive securities are excluded from the calculation of loss per share if their inclusion is anti-dilutive. The following table shows the total outstanding securities considered anti-dilutive and therefore excluded from the computation of diluted net loss per share (in thousands):

	December 31,
	2012		2011		2010
Options for common stock		5,603		3,890		2,180
Convertible preferred stock		-		67		254
Warrants for common stock		13,830		1,609		1,535
Total		19,433		5,566		3,969