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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 ($)
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Accrued Expenses and Other Long Term Liabilities:        
Salaries payable $ 23,000 $ 119,000    
Compensated absences 211,000 195,000    
Compensation related 4,000 6,000    
Warranty reserve 8,000 8,000 $ 8,000 $ 8,000
Operating lease 152,000 39,000    
Other 54,000 189,000    
Total 452,000 556,000    
Less current portion (440,000) (539,000)    
Long term portion $ 12,000 $ 17,000