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Stock-Based Compensation Plan - number of options outstanding and weighted average exercise price related to shares set aside for the 2017 Stock Option Plan 3 (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
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]          
Stock based compensation expense $ 41,963 $ 34      
2017 Stock Option Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Weighted average grant date fair value of options granted     $ 6.21    
Stock option          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Weighted average grant date fair value of options granted     $ 6.55    
Stock option | 2011 Stock Option Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Grants during the period 0 0 0 0 0
Forfeitures during the period 0        
Exercised 56,059   0 0 0
Exercise price $ 0.58 $ 0.59 $ 0.59 $ 0.59  
Stock based compensation expense     $ 45 $ 113 $ 151
Outstanding intrinsic value     0    
Exercisable intrinsic value     0    
Unrecognized compensation cost     $ 33    
Unrecognized compensation cost, recognition period       4 months 10 days  
Stock option | 2017 Stock Option Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Grants during the period     1,116,101 1,569,676 2,665,921
Forfeitures during the period       1,323,787 66,253
Exercise price $ 0.92   $ 0.92 $ 0.92 $ 0.92
Expiration period 10 years   10 years    
Stock based compensation expense $ 38,800   $ 0 $ 0  
Weighted average grant date fair value of options granted     $ 0.61    
Unrecognized compensation cost $ 4,500   $ 236    
Unrecognized compensation cost, recognition period 4 years