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5. Trade Receivables, net (Tables)
6 Months Ended
Jun. 30, 2019
Accounts Receivable, after Allowance for Credit Loss [Abstract]  
Trade receivables, net
   

June 30,

2019

   

December 31,

2018

 
Gross trade receivables   $ 548     $ 443  
Less: allowance for doubtful accounts     (24 )     (14 )
Trade receivables, net   $ 524     $ 429  
                 
Current trade receivables, net   $ 517     $ 419  
Long-term trade receivables, net     7       10  
Trade receivables, net   $ 524     $ 429