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Concentrations of Risk (Details)	12 Months Ended
	Dec. 29, 2018	Dec. 30, 2017	Dec. 31, 2016
Concentration Risk [Line Items]
Concentrations of risk, percentage	10.00%
Percent of Gross Accounts Receivable | Credit concentration risk | Scott Safety [Member]
Concentration Risk [Line Items]
Concentrations of risk, percentage		14.00%
Percent of Gross Accounts Receivable | Credit concentration risk | RealWear, Inc. [Member]
Concentration Risk [Line Items]
Concentrations of risk, percentage	31.00%	10.00%
Percent of Gross Accounts Receivable | Credit concentration risk | DRS Technologies [Member]
Concentration Risk [Line Items]
Concentrations of risk, percentage	11.00%
Percent of Gross Accounts Receivable | Credit concentration risk | Collins Aerospace [Member]
Concentration Risk [Line Items]
Concentrations of risk, percentage	11.00%
Percent of Gross Accounts Receivable | Credit concentration risk | U.S. Army [Member]
Concentration Risk [Line Items]
Concentrations of risk, percentage		43.00%
Sales as a Percent of Total Revenue | Customer concentration risk | DRS Technologies [Member]
Concentration Risk [Line Items]
Concentrations of risk, percentage		10.00%
Sales as a Percent of Total Revenue | Customer concentration risk | Collins Aerospace [Member]
Concentration Risk [Line Items]
Concentrations of risk, percentage	20.00%	10.00%	12.00%
Sales as a Percent of Total Revenue | Customer concentration risk | Shenzhen Oriscape [Member]
Concentration Risk [Line Items]
Concentrations of risk, percentage			20.00%
Sales as a Percent of Total Revenue | Customer concentration risk | Military Customers in Total
Concentration Risk [Line Items]
Concentrations of risk, percentage	36.00%	48.00%	24.00%
Sales as a Percent of Total Revenue | Customer concentration risk | General Dynamics [Member]
Concentration Risk [Line Items]
Concentrations of risk, percentage	11.00%
Sales as a Percent of Total Revenue | Customer concentration risk | U.S. Army [Member]
Concentration Risk [Line Items]
Concentrations of risk, percentage		12.00%
Sales as a Percent of Total Revenue | United States Government Funded Research and Development Contracts
Concentration Risk [Line Items]
Concentrations of risk, percentage	20.00%	11.00%	7.00%

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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

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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