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Inventory (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 28, 2019	Jun. 29, 2018	Dec. 28, 2018
Inventory [Line Items]
Raw materials	$ 2,482		$ 1,922
Work in process	8,571		6,170
Finished goods	6,630		3,836
Total	17,683		11,928
Write-downs on inventory	400	$ 500
Current portion included in Inventory
Inventory [Line Items]
Total	12,352		9,838
Long-term portion included in Other long-term assets
Inventory [Line Items]
Total	$ 5,331		$ 2,090

X

- Definition

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

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.6(a)(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

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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- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section 50
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