Earnings 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
Net loss (Numerator):
Net loss, basic and diluted	$ (3,513)	$ (4,264)	$ (13,587)	$ (8,713)
Shares (Denominator):
Weighted average common shares outstanding	43,184	42,806	43,039	42,564
Shares used in basic computation	43,184	42,806	43,039	42,564
Common shares issuable upon exercise of stock options (treasury stock method)	0	0	0	0
Shares used in diluted computation	43,184	42,806	43,039	42,564
Net loss per share:
Basic	$ (0.08)	$ (0.10)	$ (0.32)	$ (0.20)
Diluted	$ (0.08)	$ (0.10)	$ (0.32)	$ (0.20)