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9. Accrued Expenses (Details 1) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2020
Dec. 31, 2019
Payables and Accruals [Abstract]    
Beginning balance $ 37 $ 16
Accrual for warranties 18 37
Adjustments related to pre-existing warranties   7
Warranty settlements (12) (23)
Ending balance $ 43 $ 37