The Company and Significant Accounting Policies (Details 1) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Numerator:
Net income (loss) applicable to common stockholders	$ 7,233	$ (1,384)	$ 5,904	$ (6,168)
Denominator:
Weighted average common shares outstanding	85,940,225	85,055,659	85,861,671	85,049,518
Per share:
Net income (loss) per share applicable to common stockholders	$ 0.08	$ (0.02)	$ 0.07	$ (0.07)
Numerator:
Net income (loss) applicable to common stockholders	$ 7,233	$ (1,384)	$ 5,904	$ (6,168)
Denominator:
Weighted average common shares outstanding	85,940,225	85,055,659	85,861,671	85,049,518
Dilutive securities:
Stock options and restricted stock units	446,430		359,197
Diluted shares outstanding	86,386,655	85,055,659	86,220,868	85,049,518
Per share:
Net income (loss) per share applicable to common stockholders	$ 0.08	$ (0.02)	$ 0.07	$ (0.07)