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Warrant derivative liability, Fair value of warrant derivative liability (Q1) (Details)

v3.20.2
Warrant derivative liability, Fair value of warrant derivative liability (Q1) (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Dec. 31, 2018
Warrant Derivative Liability [Abstract]        
Balance as of period start $ 2,220 $ 0 $ 0  
Change in fair value of derivative liability (1,379) $ 0 90 $ 0
Balance as of period end $ 841   $ 2,220 $ 0