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Revenue (Tables)
 9 Months Ended
Sep. 28, 2019
Revenue from Contract with Customer [Abstract]  
Revenue from external customers by product group The following table shows the percentage of product and related maintenance revenue contributed by each of Cadence’s five product categories and services for the three and nine months ended September 28, 2019 and September 29, 2018:
 
Three Months Ended
 
Nine Months Ended
 
September 28,
2019
 
September 29,
2018
 
September 28,
2019
 
September 29,
2018
Functional Verification, including Emulation and Prototyping Hardware1
20
%
 
22
%
 
22
%
 
24
%
Digital IC Design and Signoff
30
%
 
30
%
 
30
%
 
29
%
Custom IC Design and Simulation
26
%
 
26
%
 
26
%
 
26
%
System Interconnect and Analysis
9
%
 
9
%
 
9
%
 
9
%
IP
15
%
 
13
%
 
13
%
 
12
%
Total
100
%
 
100
%
 
100
%
 
100
%

_____________
1 Includes immaterial amount of revenue accounted for under Topic 842.
Contract balances
Cadence’s contract balances as of September 28, 2019 and December 29, 2018 were as follows:
 
As of
 
September 28,
2019
 
December 29,
2018
 
(In thousands)
Contract assets
$
8,513

 
$
10,055

Deferred revenue
392,136

 
401,174