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Consolidated Statement of Cash Flows (Parenthetical) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Statement Of Cash Flows [Abstract]      
Accounts receivable from related party $ 98 $ 353 $ 578
Accrued liabilities from related party $ (1,343) $ (430) $ (2,549)