The Company and Significant Accounting Policies (Details 1) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Numerator:
Net income (loss) applicable to common stockholders	$ 5,073	$ 2,066	$ 4,116	$ (1,329)
Denominator:
Weighted average common shares outstanding	87,074,952	85,837,846	86,768,686	85,821,963
Per share:
Net income (loss) per share applicable to common stockholders	$ 0.06	$ 0.02	$ 0.05	$ (0.02)
Numerator:
Net income (loss) applicable to common stockholders	$ 5,073	$ 2,066	$ 4,116	$ (1,329)
Denominator:
Weighted average common shares outstanding	87,074,952	85,837,846	86,768,686	85,821,963
Dilutive securities:
Stock options and restricted stock units	2,153,838	340,485	1,379,228
Diluted shares outstanding	89,228,790	86,178,331	88,147,914	85,821,963
Per share:
Net income (loss) per share applicable to common stockholders	$ 0.06	$ 0.02	$ 0.05	$ (0.02)