Quarterly report pursuant to Section 13 or 15(d)

Shareholders' Equity - Additional Information (Details)

v3.19.3
Shareholders' Equity - Additional Information (Details) - USD ($)
 1 Months Ended 9 Months Ended
Aug. 31, 2017
Sep. 28, 2019
Sep. 29, 2018
Dec. 29, 2018
Dec. 30, 2017
Shareholders Equity [Line Items]          
Common stock, shares authorized (in shares)   10,000,000   10,000,000  
Stock issued new during period, shares   223,214    
Common stock, issued shares (in shares)   1,917,779   1,694,565  
Common stock, outstanding shares (in shares)   1,917,779   1,694,565  
Options outstanding   44,400,000   100,900,000 125,500,000
Options granted   0 0    
Share-based compensation expense   $ 712,000 $ 596,000    
Estimated future share-based compensation expense   554,000      
Estimated future share-based compensation expense per month   $ 51,000      
Warrants outstanding   33,000   33,000  
Warrant exercise price   $ 3.40   $ 3.40  
Warrant expiration date   May 31, 2020      
Preferred stock, shares authorized (in shares)   2,000,000   2,000,000  
Conversion of stock, description   On June 21, 2019, the shares of Series A Preferred Stock were exchanged for shares of Series A-1 Preferred Stock on a one-for-one basis.      
Series A Convertible Preferred Stock | GeoTraq Inc.          
Shareholders Equity [Line Items]          
Stock issued in acquisition 288,588        
Stock Options          
Shareholders Equity [Line Items]          
Share-based compensation expense   $ 0 $ 0    
Closing stock price used in pre-tax intrinsic value   $ 2.90      
In-the-money options exercisable (in shares)   0   0  
2016 Plan          
Shareholders Equity [Line Items]          
Options expiration date   Oct. 28, 2026      
Options authorized for issuance   400,000,000      
Options outstanding   4,000,000   4,000,000  
2016 Plan | Employees          
Shareholders Equity [Line Items]          
Options granted, vesting period   2 years      
2016 Plan | Non-Employee Directors          
Shareholders Equity [Line Items]          
Options granted, vesting period   6 months      
2011 Plan          
Shareholders Equity [Line Items]          
Options expiration date   May 12, 2021      
Options outstanding   40,400,000   97,000,000  
Additional awards to be granted after adoption of 2016 plan   0      
Articles of Incorporation          
Shareholders Equity [Line Items]          
Common stock, shares authorized (in shares)   10,000,000