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CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares
Jun. 30, 2019
Dec. 31, 2018
Statement of Financial Position [Abstract]    
Common stock, par value (in dollars per share) $ 0.001 $ 0.001
Common stock, shares authorized (in shares) 250,000,000.0 250,000,000
Common stock, shares issued (in shares) 35,762,000 35,687,000
Common stock, shares outstanding (in shares) 35,762,000 35,687,000