Stock-Based Compensation (Tables)

6 Months Ended

Jun. 29, 2013

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

Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs

The table below shows stock-based compensation charges included in the Condensed Consolidated Statements of Operations (in thousands):

	Three Months Ended				Six Months Ended
	June 29, 2013		June 30, 2012		June 29, 2013		June 30, 2012
Stock-based compensation included in:
Cost of revenues	$	638	$	716	$	1,162	$	1,229
Research and development	841		1,249		1,842		2,298
Selling, general and administrative	1,653		1,513		3,163		2,994
Total stock-based compensation	3,132		3,478		6,167		6,521
Tax effect on stock-based compensation	—		—		—		—
Total stock-based compensation, net of tax	$	3,132	$	3,478	$	6,167	$	6,521

Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions

The following weighted-average assumptions were used in the estimated grant-date fair value calculations for stock options:

	Three Months Ended				Six Months Ended
	June 29, 2013		June 30, 2012		June 29, 2013		June 30, 2012
Stock Options:
Dividend yield	—	%	—	%	—	%	—	%
Expected volatility	—	%	—	%	—	%	47.7	%
Risk-free interest rate	—	%	—	%	—	%	0.46	%
Expected term (in years)	0		0		0		3.49

Schedule of Share-based Payment Award, Employee Stock Purchase Plan, Valuation Assumptions

The following weighted-average assumptions were used in estimating the fair value of employees' purchase rights under our approved employee stock purchase plans:

	Three Months Ended				Six Months Ended
	June 29, 2013		June 30, 2012		June 29, 2013		June 30, 2012
ESPP:
Dividend yield	—	%	—	%	—	%	—	%
Expected volatility	38.4	%	47.0	%	40.7	%	47.6	%
Risk-free interest rate	0.11	%	0.09	%	0.15	%	0.12	%
Expected term (in years)	0.5		0.5		0.6		0.5

Schedule of Unrecognized Compensation Cost, Nonvested Awards

At June 29, 2013, the unrecognized stock-based compensation, adjusted for estimated forfeitures, was as follows (in thousands): 

	Unrecognized Expense		Average Expected Recognition Period in Years
Stock options	$	1,472	1.00
Restricted stock units	10,644		1.76
Employee Stock Purchase Plan	62		0.09
Total unrecognized stock-based compensation expense	$	12,178