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Preferred Stock (Details) - USD ($)
$ / shares in Units, $ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2020
Jan. 16, 2019
Dec. 31, 2009
Mar. 31, 2009
Preferred Stock              
Warrants to purchase the Company's common stock, initially authorized (in shares)         815,339    
Preferred stock, Shares authorized       300,000      
Series B Preferred Stock [Member]              
Preferred Stock              
Fair value             $ 68.2
Shares redeemed (in shares)   73,000 73,000        
Warrant [Member]              
Preferred Stock              
Warrants, term 10 years            
Warrants to purchase the Company's common stock, initially authorized (in shares)           815,339  
Warrants, exercise price (in dollars per share) $ 13.43            
Fair value             $ 4.8