Stock-Based Compensation Expense (Tables)

9 Months Ended

Sep. 29, 2013

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

The following table summarizes the Company’s stock option activity for the nine-month period ended September 29, 2013:


	Shares (in thousands)			Weighted- Average Exercise Price		Weighted- Average Remaining Contractual Term (in years)		Aggregate Intrinsic Value (in thousands)
Outstanding as of December 31, 2012		7,118		$	12.78
Granted		1,711			21.29
Exercised		(2,275	)		11.42
Forfeited or expired		(259	)		16.29

Outstanding as of September 29, 2013		6,295		$	15.44		7.4	$	100,525

Exercisable as of September 29, 2013		1,806		$	11.55		5.4	$	35,855

Options vested or expected to vest at September 29, 2013 (1)		5,577		$	15.09		7.2	$	91,041

(1)	In addition to the vested options, the Company expects a portion of the unvested options to vest at some point in the future. Options expected to vest are calculated by applying an estimated forfeiture rate to the unvested options.

Weighted-Average Assumptions Used in Estimating Fair Values of Stock Options Granted

The fair values of stock options granted in each period presented were estimated using the following weighted-average assumptions:


	Three-months Ended						Nine-months Ended
	September 29, 2013			September 30, 2012			September 29, 2013			September 30, 2012
Risk-free rate		2.0	%		2.0	%		2.0	%		2.0	%
Expected dividend yield		0	%		1.2	%		0	%		1.2	%
Expected volatility		42	%		44	%		42	%		44	%
Expected term (in years)		5.9			5.6			5.9			5.6

Stock-Based Compensation Expense

The following table details the stock-based compensation expense by caption for each period presented on the Consolidated Statements of Operations (in thousands):


	Three-months Ended				Nine-months Ended
	September 29, 2013		September 30, 2012		September 29, 2013		September 30, 2012
Product cost of revenue	$	160	$	99	$	564	$	474
Service cost of revenue		33		26		143		134
Research, development, and engineering		546		385		2,009		1,735
Selling, general, and administrative		1,481		982		5,583		4,452

	$	2,220	$	1,492	$	8,299	$	6,795