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Concentrations of Risk (Details) | 12 Months Ended
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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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