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Incentive Compensation Plans - Narrative (Q1) (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Jan. 12, 2021
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Period of automatic increases in shares authorized 10 years          
Yearly automatic percent increases in shares authorized       4.00%    
Options, grants in period (in shares)   8,114,196        
Weighted average exercise price of options granted (in USD per share)   $ 16.74        
Weighted average grant date fair value of options granted in period (in USD per share)   $ 6.52        
Unrecognized compensation cost   $ 41,744   $ 10,931    
Unrecognized compensation cost weighted average period for recognition       2 years 10 months 2 days    
Employer matching contribution, percent of match   50.00%   0.50%    
Employer matching contribution percent of employees' contributions   6.00%   6.00%    
Defined contribution plan costs   $ 497 $ 352 $ 378 $ 1,250 $ 998
Vesting requirements   4 years   4 years    
Maximum            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Requisite service period of award       5 years    
Options to purchase common stock            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Options, grants in period (in shares)       8,818,051 1,770,289  
Weighted average grant date fair value of options granted in period (in USD per share)       $ 1.47 $ 1.45 $ 1.06
Unrecognized compensation cost weighted average period for recognition   3 years 2 months 12 days        
Restricted Stock Units (RSU's)            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Number of RSU's granted in period (in shares)   836,208        
2020 Plan            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Number of shares authorized (in shares) 14,526,237          
Yearly automatic percent increases in shares authorized 4.00%          
Options, grants in period (in shares)   7,651,600        
Number of shares available for grant (in shares)   8,040,902,000        
2020 Plan | Restricted Stock Units (RSU's)            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Unrecognized compensation cost weighted average period for recognition   2 years 8 months 12 days        
Weighted average grant date fair value of RSU's granted in period (in USD per share)   $ 16.80        
Unrecognized compensation cost   $ 12,415        
2020 Plan | Restricted Stock Units (RSU's) | Maximum            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Requisite service period of award   4 years        
2020 Plan | Restricted Stock Units (RSU's) | Minimum            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Requisite service period of award   1 month        
2020 ESPP            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Number of shares authorized (in shares) 1,452,623          
Yearly automatic percent increases in shares authorized 1.00%          
Shares issued in period (in shares)   0        
2014 Plan            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Options, grants in period (in shares)   462,596