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5. Trade Receivables, net (Tables)
6 Months Ended
Jun. 30, 2020
Accounts Receivable, after Allowance for Credit Loss [Abstract]  
Trade receivables, net
   

June 30,

2020

   

December 31,

2019

 
Gross trade receivables   $ 612     $ 400  
Less: allowance for doubtful accounts     (43 )     (14 )
Trade receivables, net   $ 569     $ 386  
                 
Current trade receivables, net   $ 567     $ 380  
Long-term trade receivables, net     2       6  
Trade receivables, net   $ 569     $ 386