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Warrant derivative liability - Fair value of warrant derivative liability (Q3) (Details)

v3.20.4
Warrant derivative liability - Fair value of warrant derivative liability (Q3) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Dec. 31, 2018
Warrant Liability [Roll Forward]              
Balance, beginning of period $ 4,315 $ 841 $ 2,220 $ 2,220 $ 0 $ 0  
Change in fair value of derivative liability (4,213) 3,474 (1,379) (2,118) $ (886) 90 $ 0
Balance as of period end $ 102 $ 4,315 $ 841 $ 102   $ 2,220 $ 0