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Employee Benefit Plans (Schedule of Total Stock-Based Compensation Expense Resulting from Stock Options, Restricted Stock Awards, and the Employee Stock Purchase Plan) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 29, 2019	Sep. 30, 2018	Sep. 29, 2019	Sep. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation		$ 3,437		$ 9,384
Direct
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation	$ 5,219	3,437	$ 15,261	5,336
Indirect
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation		0		4,048
Cost of revenue
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation		236		919
Cost of revenue | Direct
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation	467	236	1,286	336
Cost of revenue | Indirect
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation		0		583
Research and development
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation		872		2,582
Research and development | Direct
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation	1,569	872	4,501	2,186
Research and development | Indirect
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation		0		396
Sales and marketing
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation		754		2,208
Sales and marketing | Direct
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation	791	754	2,722	1,239
Sales and marketing | Indirect
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation		0		969
General and administrative
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation		1,575		3,675
General and administrative | Direct
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation	$ 2,392	1,575	$ 6,752	1,575
General and administrative | Indirect
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation		$ 0		$ 2,100

X

- Definition

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5047-113901

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 14.F)
-URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(1)(i)
-URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901

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