Stockholders' Equity and Employee Stock Option Plans (Details Textual) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Stockholders' Equity and Employee Stock Option Plans (Textual) [Abstract]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period	0		0
Total intrinsic value of options exercised		$ 86,000		$ 1,200,000
Total fair value of RSUs vested and released	723,000	3,400,000	742,000	4,600,000
Non-vested restricted stock units and restricted stock awards	230,000		230,000
Cumulative expense recognized			$ 621,000