Basis of Presentation and Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2013

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,
	2013		2012		2011
Options for common stock		7,087		5,603		3,890
Convertible preferred stock		-		-		67
Warrants for common stock		15,839		13,840		1,609
Total		22,926		19,443		5,566