Net Income (Loss) Per Share (Details Textual)	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Net Income Loss Per Share Basic (Textual) [ Abstract]
Antidilutive securities excluded from computation of earning per share	6,949,231	3,926,350	6,992,316	2,251,563