Quarterly report pursuant to Section 13 or 15(d)

STOCK-BASED COMPENSATION - Option Activity (Details)

v3.21.2
STOCK-BASED COMPENSATION - Option Activity (Details) - Equity Option - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2021
Dec. 31, 2020
Number of Shares    
Options outstanding, beginning balance (shares) 25,225  
Options outstanding, granted (shares) 6,550  
Options outstanding, exercised (shares) (2)  
Options outstanding, forfeited (shares) (632)  
Options outstanding, ending balance (shares) 31,141 25,225
Weighted Average Exercise Price    
Beginning balance (in USD per share) $ 0.48  
Granted (in USD per share) 0.55  
Exercised (in USD per share) 0.26  
Forfeited (in USD per share) 0.58  
Ending balance (in USD per share) $ 0.50 $ 0.48
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]    
Options outstanding, exercisable (shares) 25,221  
Options outstanding, vested or expected to vest (shares) 31,141  
Weighted average exercise price, exercisable (in USD per share) $ 0.48  
Weighted average exercise price, vested or expected to vest (in USD per share) $ 0.50  
Weighted average remaining contract term 5 years 10 months 24 days 5 years 8 months 12 days
Weighted average remaining contract term, exercisable 5 years 1 month 6 days  
Weighted average remaining contract term, vested or expected to vest 5 years 10 months 24 days  
Aggregate intrinsic value $ 51 $ 2,186
Aggregate intrinsic value, exercisable 51  
Aggregate intrinsic value, vested or expected to vest $ 51