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Consolidated Statements of Cash Flows (Parenthetical) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Statement Of Cash Flows [Abstract]      
Accounts receivable from related party $ (43,206) $ 98 $ 353
Accrued liabilities from related party $ 172 $ (1,343) $ (430)