Stock-Based Compensation (Tables)

3 Months Ended

Apr. 02, 2016

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

Stock-based compensation expense recognized under ASC Topic 718, Compensation – Stock Compensation (“ASC 718”), for employees and directors and the effect on our Condensed Consolidated Statements of Operations were as follows:



	Three Months Ended
(In thousands)	April 2, 2016		April 4, 2015
Cost of sales	$	187	$	227
Research, development, and engineering	801		860
Selling, general and administrative expenses	2,491		3,304
Total stock-based compensation expense	$	3,479	$	4,391

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

We used the following weighted-average assumptions to estimate the fair value of our stock options granted:



	Three Months Ended
	April 2, 2016	April 4, 2015
Expected life (in years)	5.9	5.9
Risk-free interest rate	1.7%	1.6%
Volatility	43%	44%
Dividend yield	—%	—%