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

Subsequent events (Q3) (Details)

v3.20.4
Subsequent events (Q3) (Details) - USD ($)
$ / shares in Units, $ in Millions
 1 Months Ended
Oct. 01, 2020
Oct. 31, 2020
Sep. 30, 2020
Jun. 24, 2020
Jun. 23, 2020
Dec. 31, 2019
May 06, 2019
Dec. 31, 2018
Dec. 12, 2018
Subsequent Event [Line Items]                  
Unit price (in dollars per share)                 $ 1.95
Common stock, par value (in dollars per share)     $ 0.001     $ 0.001 $ 0.001 $ 0.001  
Warrants, exercise price (in dollars per share)       $ 4.25 $ 5.00        
Number of warrants included in each unit (in shares)                 1
Series F private placement                  
Subsequent Event [Line Items]                  
Common stock, par value (in dollars per share)     $ 0.001            
Subsequent events                  
Subsequent Event [Line Items]                  
Units issued upon conversion (in shares)   3,500              
Number of options repriced (in shares) 6,077,731                
Options repriced, exercise price premium 20.00%                
Options repriced, exercise price (in dollars per share) $ 0.60                
Subsequent events | Series F private placement                  
Subsequent Event [Line Items]                  
Unit price (in dollars per share)   $ 1,000              
Preferred stock, conversion terms, value of common stock per share (in dollars per share)   $ 0.50              
Term of warrants   6 years              
Warrants, exercise price (in dollars per share)   $ 0.75              
Gross cash proceeds   $ 21.7              
Number of warrants included in each unit (in shares)   1              
Subsequent events | Officers and directors | Series F private placement                  
Subsequent Event [Line Items]                  
Gross cash proceeds   $ 11.5              
Subsequent events | Series F Preferred Stock                  
Subsequent Event [Line Items]                  
Preferred stock, authorized (in shares) 30,000                
Subsequent events | Series F Preferred Stock | Series F private placement                  
Subsequent Event [Line Items]                  
Preferred stock, par value (in dollars per share)   $ 0.001              
Number of shares of stock included in each unit (in shares)   1