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Consolidated Statement of Cash Flows (Parenthetical) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Statement Of Cash Flows [Abstract]      
Accounts receivable from related party $ 353 $ 578 $ 979
Accrued liabilities from related party $ (430) $ (2,549) $ 1,828