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Condensed Consolidated Statements of Operations and Comprehensive Loss (Parenthetical) (unaudited) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2018
Income Statement [Abstract]    
Interest expense attributable to related parties $ 1,005 $ 1,867
Other expense attributable to related parties $ 191 $ 1,585