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Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Statement Of Financial Position [Abstract]    
Accounts receivable from related party $ 4,004 $ 4,102
Accrued liabilities to related party $ 272 $ 1,615
Preferred stock, par value $ 0.01 $ 0.01
Preferred stock, shares authorized 125,000,000 125,000,000
Preferred stock, shares issued 0 0
Preferred stock, shares outstanding 0 0
Common stock, par value $ 0.01 $ 0.01
Common stock, shares authorized 225,000,000 225,000,000
Common stock, shares issued 82,498,000 63,665,000
Common stock, shares outstanding 82,498,000 63,665,000