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Revenues - Revenues Disaggregated by Geographic Region (Details) - USD ($) $ in Thousands	3 Months Ended			6 Months Ended
	Jun. 29, 2018	Mar. 30, 2018	Jun. 30, 2017	Jun. 29, 2018	Jun. 30, 2017
Disaggregation of Revenue [Line Items]
Total revenues	$ 186,108	$ 213,700	$ 99,008	$ 399,827	$ 179,895
U.S.
Disaggregation of Revenue [Line Items]
Total revenues	150,079		89,371	287,072	163,046
Europe
Disaggregation of Revenue [Line Items]
Total revenues	34,043		5,494	87,852	10,024
Rest of the world
Disaggregation of Revenue [Line Items]
Total revenues	$ 1,986		$ 4,143	$ 24,903	$ 6,825

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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