Basis of Presentation and Significant Accounting Policies - Restatement (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 30, 2019	Mar. 31, 2018
Cost of revenue:
Amortization of intangible assets	$ 8,252	$ 5,341
Restructuring and related	21,466	17
Total cost of revenue	226,275	120,513
Operating expenses:
Research and development	73,660	58,681
Sales and marketing	40,037	28,885
General and administrative	33,044	17,836
Amortization of intangible assets	7,057	1,607
Restructuring and related	17,188	(163)
Total operating expenses	178,120	106,846
Product
Cost of revenue:
Cost of revenue	157,817	102,324
Services
Cost of revenue:
Cost of revenue	$ 36,676	12,831
Previously Reported
Cost of revenue:
Restructuring and related		17
Total cost of revenue		120,513
Operating expenses:
Research and development		58,681
Sales and marketing		30,492
General and administrative		17,836
Restructuring and related		(163)
Total operating expenses		106,846
Previously Reported | Product
Cost of revenue:
Cost of revenue		107,665
Previously Reported | Services
Cost of revenue:
Cost of revenue		12,831
Change in Presentation Reclassification
Cost of revenue:
Amortization of intangible assets		5,341
Restructuring and related		0
Total cost of revenue		0
Operating expenses:
Research and development		0
Sales and marketing		(1,607)
General and administrative		0
Amortization of intangible assets		1,607
Restructuring and related		0
Total operating expenses		0
Change in Presentation Reclassification | Product
Cost of revenue:
Cost of revenue		(5,341)
Change in Presentation Reclassification | Services
Cost of revenue:
Cost of revenue		$ 0