Stockholders' Equity and Employee Stock Option Plans (Details Textual) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Stockholders' Equity and Employee Stock Option Plans (Textual) [Abstract]
Total intrinsic value of options exercised	$ 0		$ 0	$ 3,000
Total fair value of RSUs vested and released	$ 72,000	$ 1,900,000	316,000	$ 2,000,000
Cumulative expense recognized for performance awards			$ 0