Net Loss Per Share (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Basic and diluted net loss per share
Net loss	$ (2,224)	$ (2,041)	$ (5,486)	$ (6,605)
Loss per share:
Basic	$ (0.10)	$ (0.09)	$ (0.25)	$ (0.28)
Diluted	$ (0.10)	$ (0.09)	$ (0.25)	$ (0.28)
Weighted average number of shares of common stock outstanding during the period used to compute basic net earnings per share	21,751	23,381	22,151	23,410
Weighted average number of shares of common stock used to compute diluted net earnings per share	21,751	23,381	22,151	23,410