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Revenue (Tables) | 9 Months Ended
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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 Hardware 1 | 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 |

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- Definition Tabular disclosure of entity-wide revenues from external customers for each product or service or each group of similar products or services if the information is not provided as part of the reportable operating segment information. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 40 -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e9031-108599 + Details
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