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Subsequent Events (Q3) (Details) - USD ($)
$ in Thousands
Oct. 07, 2021
Sep. 30, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Subsequent Event [Line Items]          
Contingent consideration     $ 660 $ 1,066 $ 0
iController BV          
Subsequent Event [Line Items]          
Acquisition costs   $ 500      
Subsequent Event | iController BV          
Subsequent Event [Line Items]          
Equity interest acquired 100.00%        
Payments to acquire businesses, gross $ 57,000        
Contingent consideration $ 600        
Additional earnings by acquiree after closing date 3 years