Stock-Based Compensation

9 Months Ended

Sep. 29, 2012

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Stock-based Compensation

Stock-Based Compensation

Stock-based compensation expense consists of vesting grants of employee and director stock options and the employee stock purchase program ("ESPP"). The table below summarizes the stock-based compensation expense for the three and nine months ended September 29, 2012 and October 1, 2011:

	Three Months Ended				Nine Months Ended
	September 29, 2012		October 1, 2011		September 29, 2012		October 1, 2011
Stock-based compensation expense:
Cost of goods sold	$	2,549	$	1,906	$	6,477	$	4,710
Research, development and engineering	2,226		2,179		6,914		6,240
Selling, general and administrative	2,589		2,051		8,228		7,392
Total stock-based compensation expense included in (loss) income from operations	$	7,364	$	6,136	$	21,619	$	18,342

Stock Option Plans

The following table summarizes the Company’s stock option transactions for the nine months ended September 29, 2012:

	Nine Months Ended
	September 29, 2012
	Shares		Weighted- average exercise price per share
Outstanding at December 31, 2011	29,547		$	6.73
Granted	6,900		5.87
Exercised	(1,048	)	3.27
Forfeited	(2,027	)	8.08
Outstanding at September 29, 2012	33,372		$	6.58

ESPP

Employees participating in the ESPP authorize the Company to withhold compensation and to use the withheld amounts to purchase shares of the Company's common stock at a discount.

The table below summarizes the ESPP common stock purchases for the three and nine months ended September 29, 2012 and October 1, 2011.

	Three Months Ended		Nine Months Ended
	September 29, 2012	October 1, 2011	September 29, 2012	October 1, 2011
Shares purchased	—	—	1,770	769