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Consolidated Balance Sheets (Parenthetical) - $ / shares
Dec. 31, 2020
Dec. 31, 2019
Consolidated Balance Sheets [Abstract]    
Common stock, par value (in dollars per share) $ 0.001 $ 0.001
Common stock, shares authorized (in shares) 80,000,000 80,000,000
Common stock, shares outstanding (in shares) 55,497,133 21,635,365