General form of registration statement for all companies including face-amount certificate companies

Redeemable series E convertible preferred stock (FY) (Details)

v3.20.4
Redeemable series E convertible preferred stock (FY) (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Nov. 21, 2019
May 13, 2019
May 10, 2019
Dec. 31, 2019
Sep. 30, 2020
May 06, 2019
Dec. 31, 2018
Dec. 12, 2018
Redeemable Preferred Stock [Abstract]                
Share price (in dollars per share)               $ 1.95
Dividends [Abstract]                
Accrued dividends       $ 256 $ 359   $ 0  
Series E Convertible Preferred Stock [Member]                
Redeemable Preferred Stock [Abstract]                
Preferred stock, shares outstanding (in shares)       1,387,378   2,633,678    
Share price (in dollars per share)           $ 6.00    
Preferred stock, stated value (in dollars per share)       $ 0.99   0.99    
Preferred stock, conversion price (in dollars per share)       $ 0.78   $ 0.78    
Converted to common stock (in shares) (320,542) (236,364) (689,394)          
Number of common stock, shares issued upon conversion of preferred stock (in shares) 406,841 300,000 875,000          
Dividends [Abstract]                
Preferred stock, dividend rate       10.00%        
Accrued dividends       $ 300 $ 400   $ 0  
Redemption [Abstract]                
Preferred stock, mandatory redemption price in percentage of stated value       125.00%        
Preferred stock, mandatory redemption price (in dollars per share)       $ 1.23        
Preferred stock, mandatory redemption price in percentage of market price       75.00%