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Consolidated Balance Sheet Detail - Schedule of Accrued Expenses (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Accrued expenses and other:    
Accrued wages and employee benefits $ 296 $ 327
Customer advance   300
Professional fees, legal and consulting 229 178
IC development and wafer purchases 104 90
Warranty accrual 63 73
Interest payable 84 51
Corporate taxes 20 21
Other 359 362
Total $ 1,155 $ 1,402