For the three months ended June 29, 2014, March 30, 2014, and June 30, 2013, stock-based compensation was as follows (in thousands):

		Three Months Ended
		June 29, 2014				March 30, 2014				June 30, 2013
Cost of sales		$	1,302			$	1,330			$	1,091
Selling, general and administrative expense		3,260				3,233				2,455
Research and development expense		1,905				1,975				1,600
Total stock-based compensation expense		$	6,467			$	6,538			$	5,146

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