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5. Trade Receivables, net (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Accounts Receivable, after Allowance for Credit Loss [Abstract]    
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