Quarterly report pursuant to Section 13 or 15(d)

Mandatorily Redeemable Series B Preferred Stock (Details)

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Mandatorily Redeemable Series B Preferred Stock (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Jun. 05, 2019
Class of Stock [Line Items]      
Warrants expiration period     7 years
Common stock issued for payment of series B preferred stock dividend (in shares)   300,000  
Amortization of discount   $ 0.4  
Mandatorily Redeemable Preferred Stock      
Class of Stock [Line Items]      
Warrant to purchase shares (in shares) $ 1.62    
Exercise price of warrants (in usd per share) $ 1.62    
Value of warrants issued with preferred stock $ 6.7    
Mandatory Redeemable Series B Preferred Stock      
Class of Stock [Line Items]      
Shares issued (in shares)     1,250,000
Preferred stock stated value (in usd per share)     $ 20.00
Aggregate purchase price, warrants     $ 25.0
Mandatory Redeemable Series B Preferred Stock | Mandatorily Redeemable Preferred Stock      
Class of Stock [Line Items]      
Warrant to purchase shares (in shares)     $ 7.41
Preferred stock dividend rate (percentage) 8.00%    
Exercise price of warrants (in usd per share)     $ 7.41