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

STOCK-BASED COMPENSATION ( Stock Option Activity) (Details)

v3.21.4
STOCK-BASED COMPENSATION ( Stock Option Activity) (Details) - Stock Option Plan - USD ($)
$ / shares in Units, $ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Employees        
Number of options        
Outstanding at the beginning of the period (in shares) 9,112,121 6,721,339 5,474,026  
Granted (in shares) 1,109,750 3,698,500 1,765,665  
Forfeited (in shares) (163,330) (814,952) (213,705)  
Expired (in shares) (47,943) (413,678) (144,386)  
Exercised (in shares) (1,899,793) (79,088) (160,261)  
Outstanding at the end of the period (in shares) 8,110,805 9,112,121 6,721,339 5,474,026
Exercisable options at the end of the period (in shares) 4,867,399 4,567,670 4,274,687  
Weighted-average exercise price        
Outstanding at the beginning of the period (in USD per share) $ 0.49 $ 0.58 $ 0.52  
Granted (in USD per share) 3.76 0.82 0.85  
Forfeited (in USD per share) 1.18 0.85 0.82  
Expired (in USD per share) 0.79 0.55 0.74  
Exercised (in USD per share) 0.29 0.68 0.62  
Outstanding at the end of the period (in USD per share) 0.97 0.49 0.58 $ 0.52
Exercisable exercise price at the end of the period (in USD per share) $ 0.50 $ 0.50 $ 0.45  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures        
Outstanding option, weighted average remaining contractual term (in years) 5 years 10 months 9 days 7 years 2 months 12 days 7 years 3 months 18 days 7 years 5 months 1 day
Outstanding exercisable, weighted average remaining contractual term (in years) 4 years 6 months 4 years 9 months 18 days 6 years 7 days  
Outstanding intrinsic value at the beginning of the period $ 3,100 $ 1,758 $ 1,920  
Outstanding intrinsic value at the end of the period 65,412 3,100 1,758 $ 1,920
Outstanding exercisable intrinsic value at the end of the period $ 41,511 $ 2,301 $ 1,725  
Consultants        
Number of options        
Outstanding at the beginning of the period (in shares) 762,248 722,248 682,248  
Granted (in shares) 154,502 340,000 40,000  
Forfeited (in shares) (20,625)      
Expired (in shares)   (150,000)    
Exercised (in shares) (201,799) (150,000)    
Outstanding at the end of the period (in shares) 694,326 762,248 722,248 682,248
Exercisable options at the end of the period (in shares) 469,659 491,205 586,622  
Weighted-average exercise price        
Outstanding at the beginning of the period (in USD per share) $ 0.68 $ 0.57 $ 0.52  
Granted (in USD per share) 3.76 0.53 0.85  
Forfeited (in USD per share) 0.82      
Expired (in USD per share)   0.16    
Exercised (in USD per share) 1.67 0.16    
Outstanding at the end of the period (in USD per share) 1.08 0.68 0.57 $ 0.52
Exercisable exercise price at the end of the period (in USD per share) $ 0.78 $ 0.65 $ 0  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures        
Outstanding option, weighted average remaining contractual term (in years) 6 years 5 months 15 days 6 years 3 months 25 days 5 years 3 months 18 days 9 years 6 months
Outstanding exercisable, weighted average remaining contractual term (in years) 5 years 8 months 19 days 5 years 2 months 12 days 4 years 6 months 21 days  
Outstanding intrinsic value at the beginning of the period $ 213 $ 201 $ 1,920  
Outstanding intrinsic value at the end of the period 5,523 213 201 $ 1,920
Outstanding exercisable intrinsic value at the end of the period $ 3,876 $ 170 $ 197