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9. Accrued Expenses (Tables)
 6 Months Ended
Jun. 30, 2020
Payables and Accruals [Abstract]  
Accrued expenses
   

June 30,

2020

    

December 31,

2019

  
Accrued wages and benefits   $ 416     $ 538  
Accrued accounts payable     398       566  
Accrued sales and telecommunication taxes     449       529  
Product warranty liability     43       37  
Other     81       84  
Total accrued expenses   $ 1,387     $ 1,754  
Product warranty liabilities
    Warranty Liabilities  
Balance at January 1, 2019   $ 16  
Accrual for warranties     37  
Adjustments related to pre-existing warranties     7  
Warranty settlements     (23 )
Balance at December 31, 2019     37  
Accrual for warranties     18  
Warranty settlements     (12 )
Balance at June 30, 2020   $ 43