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Consolidated Balance Sheets (Parenthetical) - $ / shares
Dec. 31, 2019
Dec. 31, 2018
Statement of Financial Position [Abstract]    
Preferred stock, par value (USD per share) $ 0.001 $ 0.001
Preferred stock authorized (shares) 5,000,000 5,000,000
Preferred stock issued (shares) 0 0
Preferred stock outstanding (shares) 0 0
Common stock, par value (USD per share) $ 0.001 $ 0.001
Common stock authorized (shares) 200,000,000 200,000,000
Common stock issued (shares) 92,400,000 91,100,000
Common stock outstanding (shares) 91,600,000 90,000,000
Treasury stock at cost (shares) 800,000