Stock Option and Stock-Based Compensation (Tables)

9 Months Ended

12 Months Ended

Sep. 29, 2012

Dec. 31, 2011

Summary of Assumptions Used to Estimate Fair Value of Time-Based Tranche of Stock Options Granted

The following table summarizes certain assumptions we used to estimate the fair value of the Time-Based Tranche of stock options granted:

	Three Months Ended						Nine Months Ended
	September 29, 2012			October 1, 2011			September 29, 2012			October 1, 2011
Expected volatility		37.7	%		34.4	%		35.3-37.7	%		34.0-34.4	%
Risk-free interest rate		0.8	%		1.3	%		0.8-1.5	%		1.3-2.1	%
Expected years until exercise		6.1			6.6			6.1-6.2			6.4-6.6
Expected dividend yield		0.0	%		0.0	%		0.0	%		0.0	%

The following table summarizes certain assumptions we used to estimate the fair value of the Time-Based Tranche of stock options granted during the years ended December 31, 2011, 2010, and 2009:

	Year Ended December 31,
	2011			2010			2009
Expected volatility		34.0 - 34.4	%		34.2 - 35.8	%		34.4 - 34.7	%
Risk-free interest rate		1.3 - 2.1	%		2.0 -3.0	%		2.3 - 2.8	%
Expected years until exercise		6.4 - 6.6			6.4 -7.0			5.8 - 6.3
Expected dividend yield		0.0	%		0.0	%		0.0	%

Schedule of Recorded Non-cash Stock-based Compensation Expense

We recorded non-cash stock-based compensation expense during the periods presented as follows (in thousands):

	Three Months Ended				Nine Months Ended
	September 29, 2012		October 1, 2011		September 29, 2012		October 1, 2011
Cost of goods sold	$	66	$	19	$	162	$	130
Operating Expenses:
Selling, general and administrative		1,215		341		3,309		1,533
Research and development		29		9		92		37
	$	1,310	$	369	$	3,563	$	1,700

We recorded non-cash stock-based compensation expense during the periods presented as follows (in thousands):

	Year Ended December 31,
	2011		2010		2009
Cost of goods sold	$	149	$	50	$	167
Operating expenses:
Selling, general and administrative		2,493		1,764		3,062
Research and development		59		74		153
	$	2,701	$	1,888	$	3,382

Summary of Option Activity

A summary of option activity under the 2007 Plan is presented below:

	Number of Shares			Weighted- Average Exercise Price		Weighted- Average Remaining Contractual Term (Years)		Aggregate Intrinsic Value
Outstanding at December 31, 2010		7,188,284		$	14.77		6.7	$	12,221,730
Granted		983,000		$	16.46
Exercised		—
Forfeited or expired		(684,199	)	$	13.57
Outstanding at December 31, 2011		7,487,085		$	15.10		5.9	$	10,221,968
Exercisable at December 31, 2011		3,491,204		$	13.55		4.7	$	10,221,968