The Company and Summary of Significant Accounting Policies (Details 1) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Numerator for basic and diluted income per share
Net income (loss)	$ 3,676,872	$ 1,136,285	$ 10,922,936	$ (1,138,815)
Denominator for basic income per share - weighted average shares outstanding	52,509,068	58,787,274	57,997,341	60,617,787
Dilutive effect of restricted stock units	84,241		33,380
Dilutive effect of shares issuable under stock options outstanding	513,016	1,250,054	452,112
Denominator for diluted income per share - adjusted weighted average shares outstanding	53,106,325	60,037,328	58,482,833	60,617,787
Net income (loss) per common share:
Basic	$ 0.07	$ 0.02	$ 0.19	$ (0.02)
Diluted	$ 0.07	$ 0.02	$ 0.19	$ (0.02)