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Stockholders' Equity - Preferred Stock (Details) - $ / shares
Dec. 31, 2019
Dec. 31, 2018
Preferred Stock    
Preferred stock, authorized (in shares) 100,000,000 100,000,000
Preferred stock, par value (in dollars per share) $ 0.001 $ 0.001
Preferred stock, issued (in shares) 0 0
Preferred stock, outstanding (in shares) 0 0