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4. Acquisitions (Tables)
6 Months Ended
Jun. 30, 2020
Business Combinations [Abstract]  
Cost of acquisition
Consideration (including estimated unpaid contingent consideration):      
Cash   $ 217  
Contingent consideration     13  
Total consideration   $ 230  
         
Recognized amounts of identifiable assets acquired and liabilities assumed:        
Customer relationships   $ 230  
Net assets acquired   $ 230