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

Warrants - Outstanding (Q1) (Details)

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Warrants - Outstanding (Q1) (Details) - USD ($)
$ / shares in Units, $ in Millions
 1 Months Ended 3 Months Ended 8 Months Ended 12 Months Ended
Nov. 30, 2020
Jul. 20, 2020
Jun. 24, 2020
Mar. 17, 2020
Dec. 19, 2019
Nov. 04, 2019
May 06, 2019
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
May 31, 2019
Mar. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2020
Warrants                              
Warrants outstanding (in shares)                       59,501,978     16,981,854
Warrants acquired (in shares)             712,823       712,823        
Issued (in shares) 400,000 200,000 1,000,000 1,003,232 937,500 11,000     570,258 1,990,624   3,288,400   17,414,030 49,928,469
Exercised (in shares)                       (1,839,275) (1,687,690) (1,144,999) (1,937,690)
Terminated/Expired (in shares)               (2,512,321)       (76,926)     (5,470,655)
Warrants outstanding (in shares)               59,501,978       60,874,177 59,501,978 16,981,854 59,501,978
Exercise Price                              
Warrants outstanding (in dollars per share)                       $ 1.22     $ 3.23
Warrants acquired (in dollars per share)             $ 3.90       $ 3.90        
Issued (in dollars per share)                       1.45   $ 3.27 0.77
Warrants exercised (in dollars per share)                       0.76   3.50 0.58
Terminated/Expired (in dollars per share)                       0.65     3.07
Warrants outstanding (in dollars per share)               $ 1.22       $ 1.18 $ 1.22 $ 3.23 $ 1.22
Warrants outstanding, intrinsic value               $ 23.8       $ 31.3 $ 23.8 $ 12.2 $ 23.8