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Consolidated Balance Sheets (Parenthetical) - $ / shares
Dec. 31, 2018
Dec. 31, 2017
Statement of Financial Position [Abstract]    
Common stock, par value (in dollars per share) $ 0.001 $ 0.001
Common Stock, Shares Authorized 250,000,000.0 250,000,000
Common stock, issued (in shares) 35,687,000 35,650,000
Common stock, outstanding (in shares) 35,687,000 35,650,000