Net Loss Per Share (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
BASIC AND DILUTED
Weighted average number of common shares outstanding	35,437	33,021	34,366	32,934
Number of shares for computation of net loss per share	35,437	33,021	34,366	32,934
Net loss	$ (3,343)	$ (2,144)	$ (10,033)	$ (7,159)
Net loss per share - basic and diluted	$ (0.09)	$ (0.06)	$ (0.29)	$ (0.22)