Annual report pursuant to Section 13 and 15(d)

CONSOLIDATED BALANCE SHEETS (Parenthetical)

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CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares
Dec. 31, 2019
Dec. 31, 2018
Stockholders' equity:    
Preferred stock, par value (in usd per share) $ 0.001 $ 0.001
Preferred stock, shares authorized (in shares) 10,000,000 10,000,000
Preferred stock, shares issued (in shares) 0 0
Preferred stock, shares outstanding (in shares) 0 0
Common stock, par value (in usd per share) $ 0.001 $ 0.001
Common stock, shares authorized (in shares) 800,000,000 800,000,000
Common stock, shares issued (in shares) 421,508,000 417,695,000
Common stock, shares outstanding (in shares) 415,048,000 412,478,000
Treasury stock, at cost (in shares) 6,460,000 5,217,000