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

Intangible assets, royalties, and goodwill - Additional information (Q1) (Details)

v3.21.1
Intangible assets, royalties, and goodwill - Additional information (Q1) (Details) - USD ($)
3 Months Ended 12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Dec. 31, 2019
Finite-Lived Intangible Assets [Line Items]        
Amortization expense $ 400,000 $ 400,000 $ 1,500,000 $ 100,000
Goodwill 18,614,000   18,614,000 18,614,000
Goodwill, accumulated impairment loss 0   0 0
Goodwill, impairment expense $ 0 $ 0 $ 0 $ 0
Weighted Average        
Finite-Lived Intangible Assets [Line Items]        
Estimated useful lives of intangible assets 10 years