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Details of Certain Financial Statement Components and Supplemental Disclosures of Cash Flow Information and Non-Cash Activities - Components of Accrued Expenses and Other Long Term Liabilities (Detail) - USD ($)
Jun. 27, 2020
Dec. 31, 2019
Jun. 29, 2019
Dec. 31, 2018
Accrued Expenses and Other Long Term Liabilities:        
Salaries Payable $ 30,000 $ 23,000    
Compensated absences 90,000 211,000    
Compensation related 0 4,000    
Warranty reserve 0 8,000 $ 8,000 $ 8,000
Operating lease 0 152,000    
Other 0 54,000    
Total 120,000 452,000    
Less current portion (120,000) (440,000)    
Long term portion $ 0 $ 12,000