Quarterly report pursuant to Section 13 or 15(d)

STOCK-BASED COMPENSATION - Option Activity (Details)

v3.22.1
STOCK-BASED COMPENSATION - Option Activity (Details)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2022
USD ($)
$ / shares
shares
Dec. 31, 2021
USD ($)
$ / shares
shares
Number of Shares    
Options outstanding, granted (shares) 0  
Equity Option    
Number of Shares    
Options outstanding, beginning balance (shares) 30,163,000  
Options outstanding, granted (shares) 0  
Options outstanding, exercised (shares) 0  
Options outstanding, forfeited (shares) (7,872,000)  
Options outstanding, ending balance (shares) 22,291,000 30,163,000
Options outstanding, exercisable (shares) 19,120,000  
Options outstanding, vested or expected to vest (shares) 22,291,000  
Weighted Average Exercise Price    
Beginning balance (in USD per share) | $ / shares $ 0.49  
Granted (in USD per share) | $ / shares 0  
Exercised (in USD per share) | $ / shares 0  
Forfeited (in USD per share) | $ / shares 0.47  
Ending balance (in USD per share) | $ / shares 0.49 $ 0.49
Weighted average exercise price, exercisable (in USD per share) | $ / shares 0.50  
Weighted average exercise price, vested or expected to vest (in USD per share) | $ / shares $ 0.49  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]    
Weighted average remaining contract term 4 years 7 months 6 days 5 years 6 months
Weighted average remaining contract term, exercisable 3 years 10 months 24 days  
Weighted average remaining contract term, vested or expected to vest 4 years 7 months 6 days  
Aggregate intrinsic value | $ $ 8 $ 0
Aggregate intrinsic value, exercisable | $ 8  
Aggregate intrinsic value, vested or expected to vest | $ $ 8