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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) |

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