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6. Variable Interest Entity (Details) - USD ($)
$ in Thousands
 6 Months Ended 12 Months Ended
Dec. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Selling, general and administrative expenses   $ 17,424 $ 16,085
Operating loss   (4,931) (10,926)
Interest expense      
Interest rate expense   25,755 25,690
Other income   (797) (1,245)
Net loss   (39,477) $ (36,287)
GAFI      
Selling, general and administrative expenses $ 455 426  
Operating loss (455) (426)  
Interest expense      
Interest rate expense 2,865 3,142  
Debt related fees and amortization expense 690 868  
Other income (739) (675)  
Net loss $ (3,271) $ (3,761)