Quarterly report pursuant to Section 13 or 15(d)

Warrant Liabilities - Summary of Warrants Outstanding and Fair Values (Details) (Parenthetical)

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Warrant Liabilities - Summary of Warrants Outstanding and Fair Values (Details) (Parenthetical) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended 9 Months Ended
Jun. 28, 2020
Mar. 29, 2020
Jun. 28, 2020
Jun. 30, 2019
Sep. 29, 2019
 [1]
Sep. 30, 2018
 [1]
Proceeds from warrant exercised     $ 72    
Exercise price   $ 0.85        
Warrant [Member]            
Proceeds from warrant exercised $ 72 $ 72 72 72    
Fair value of warrant liability $ 48 $ (75) $ 48 $ (48)    
Warrant buyback and cancellation     88,081 88,081    
Exercise price $ 1.50 [1]   $ 1.50 [1] $ 1.50 $ 1.50 $ 1.50
[1] Based on the terms provided in the warrant agreement to purchase common stock of Optex Systems Holdings, Inc. dated August 26, 2016.