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Revenue (Tables)
 6 Months Ended
Jun. 29, 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 six months ended June 29, 2019 and June 30, 2018:
 
Three Months Ended
 
Six Months Ended
 
June 29,
2019
 
June 30,
2018
 
June 29,
2019
 
June 30,
2018
Functional Verification, including Emulation and Prototyping Hardware1
22
%
 
23
%
 
23
%
 
25
%
Digital IC Design and Signoff
31
%
 
30
%
 
31
%
 
29
%
Custom IC Design and Simulation
26
%
 
26
%
 
26
%
 
26
%
System Interconnect and Analysis
10
%
 
9
%
 
9
%
 
9
%
IP
11
%
 
12
%
 
11
%
 
11
%
Total
100
%
 
100
%
 
100
%
 
100
%
Contract Balances
Cadence’s contract balances as of June 29, 2019 and December 29, 2018 were as follows:
 
As of
 
June 29,
2019
 
December 29,
2018
 
(In thousands)
Contract assets
$
10,501

 
$
10,055

Deferred revenue
420,872

 
401,174