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Stock-Based Compensation - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 28, 2019	Sep. 29, 2018	Jun. 29, 2018	Jun. 29, 2018	Jun. 28, 2019	Jun. 29, 2018	Dec. 28, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares available for grant (in shares)	14,044,367				14,044,367
Compensation expense	$ 15,079			$ 9,283	$ 27,608	$ 18,588
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation expense	42,600				$ 42,600
Weighted-average cost recognition period					2 years 4 months 24 days
PSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
RSUs awarded (in shares)		693,131
Compensation expense			$ 2,500
RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation expense	$ 70,300				$ 70,300
Weighted-average cost recognition period					2 years 7 months 6 days
RSUs awarded (in shares)					272,660
Product revenue related performance targets, shares vested and released (in shares)	4,583,154				4,583,154		4,857,334
Achieved [Member] | PSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Product revenue related performance targets, shares vested and released (in shares)	114,843				114,843
Probable [Member] | PSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation expense	$ 2,700				$ 2,700
Product revenue related performance targets, shares vested and released (in shares)	172,272				172,272
Not Probable [Member] | PSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation expense	$ 7,500				$ 7,500

X

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

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