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 | |||||