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
Statement of Financial Position [Abstract]    
Preferred stock, par value (in dollars per share) $ 0.005 $ 0.005
Preferred stock, shares authorized (in shares) 50,000,000 50,000,000
Common stock, par value (in dollars per share) $ 0.005 $ 0.005
Common stock, shares authorized (in shares) 500,000,000 500,000,000
Common stock, shares issued (in shares) 66,320,706 61,238,898
Common stock, shares outstanding (in shares) 52,841,706 48,121,800
Treasury stock, shares (in shares) 13,479,000 13,117,098