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Stockholders' Equity - Narrative (Details) - USD ($)
9 Months Ended
Sep. 30, 2021
Dec. 31, 2020
Equity [Abstract]    
Common stock, shares authorized (in shares) 100,000,000 100,000,000
Common stock, par value (in USD per share) $ 0.001 $ 0.001
Preferred stock, shares authorized (in shares) 5,000,000 5,000,000
Preferred stock, par value (in USD per share) $ 0.001 $ 0.001
Dividends declared $ 0