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Stock-Based Compensation (Tables)
 9 Months Ended
Oct. 02, 2021
Share-based Payment Arrangement [Abstract]  
Stock-based compensation expense and allocation by cost
Stock-based compensation expense is reflected in Cadence’s condensed consolidated income statements for the three and nine months ended October 2, 2021 and September 26, 2020 as follows:
Three Months Ended Nine Months Ended
October 2,
2021		September 26,
2020		October 2,
2021		September 26,
2020
(In thousands)
Cost of product and maintenance$885 $668 $2,601 $2,042 
Cost of services1,158 850 3,177 2,599 
Marketing and sales10,784 9,699 32,284 29,826 
Research and development32,957 28,652 97,101 87,688 
General and administrative6,962 5,465 20,697 16,568 
Total stock-based compensation expense$52,746 $45,334 $155,860 $138,723