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Inventory (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 30, 2018	Mar. 31, 2017	Dec. 29, 2017
Inventory [Line Items]
Raw materials	$ 1,937		$ 498
Work in process	3,726		3,997
Finished goods	2,977		2,854
Total	8,640		7,349
Materials previously expensed included in inventory	400		400
Write-downs on inventory	0	$ 500
Inventory
Inventory [Line Items]
Total	7,563		6,657
Other long-term assets
Inventory [Line Items]
Total	$ 1,077		$ 692

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Inventory Recoveries

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Amount before valuation and LIFO reserves of completed merchandise or goods expected to be sold within one year or operating cycle, if longer.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
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Gross amount, as of the balance sheet date, of merchandise, goods, commodities, or supplies held for future sale or to be used in manufacturing, servicing or production process.

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Amount before valuation and LIFO reserves of raw materials expected to be sold, or consumed within one year or operating cycle, if longer.

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Amount before valuation and LIFO reserves of merchandise or goods in the production process expected to be completed within one year or operating cycle, if longer.

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Amount of loss from reductions in inventory due to subsequent measurement adjustments, including, but not limited to, physical deterioration, obsolescence, or changes in price levels.

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-Publisher FASB
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