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Stock Based Compensation
 9 Months Ended
Sep. 26, 2020
Share-based Payment Arrangement [Abstract]  
STOCK-BASED COMPENSATION STOCK-BASED COMPENSATION
Stock-based compensation expense is reflected in Cadence’s condensed consolidated income statements for the three and nine months ended September 26, 2020 and September 28, 2019 as follows:
Three Months Ended Nine Months Ended
September 26,
2020		September 28,
2019		September 26,
2020		September 28,
2019
(In thousands)
Cost of product and maintenance$668 $731 $2,042 $2,064 
Cost of services850 931 2,599 2,626 
Marketing and sales9,699 10,424 29,826 29,039 
Research and development28,652 30,458 87,688 85,015 
General and administrative5,465 5,735 16,568 16,045 
Total stock-based compensation expense$45,334 $48,279 $138,723 $134,789 
Cadence had total unrecognized compensation expense related to stock option and restricted stock grants of $233.0 million as of September 26, 2020, which will be recognized over the remaining vesting period. The remaining weighted-average vesting period of unvested awards is 2.0 years.