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Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Statement Of Financial Position [Abstract]    
Allowance for accounts receivable $ 0 $ 0
Preferred stock, par value $ 0.0001 $ 0.0001
Preferred stock, shares authorized 10,000,000 10,000,000
Preferred stock, shares designated 0 0
Preferred stock, shares issued 0 0
Preferred stock, shares outstanding 0 0
Common stock, par value $ 0.0001 $ 0.0001
Common stock, shares authorized 300,000,000 300,000,000
Common stock, shares issued 159,524,000 153,212,000
Common stock, shares outstanding 159,524,000 153,212,000