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Condensed Consolidated Balance Sheets (unaudited) (Parentheticals) - $ / shares
Jun. 30, 2022
Dec. 31, 2021
Statement of Financial Position [Abstract]    
Common stock, par value (in dollars per share) $ 0.0001 $ 0.0001
Common stock, authorized (in shares) 500,000,000 500,000,000
Common stock, issued (in shares) 248,068,603 247,358,412
Common stock, outstanding (in shares) 248,068,603 247,358,412
Treasury stock (in shares) 490,011 318,086