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19. Amount Due to an Affiliate (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Amount Due To Affiliate    
Amount due to an affiliate, current $ 9,128 $ 8,819
Amount due to an affiliate, noncurrent 1,728 0
Total amount due to an affiliate $ 10,856 $ 8,819