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SHARE-BASED COMPENSATION - Share-based Payment Arrangement, Option, Exercise Price Range (Details)
12 Months Ended
Dec. 31, 2021
$ / shares
shares
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]  
Number of outstanding options (in shares) | shares 113,287,066
Weighted-average remaining contractual term of outstanding options 8 years 3 months 10 days
Weighted-average exercise price of outstanding options (in USD per share) $ 0.20
Number of exercisable options (in shares) | shares 100,391,350
Weighted-average remaining contractual term of exercisable options 8 years 2 months 19 days
Weighted-average exercise price of exercisable options (in USD per share) $ 0.17
$0.00 - $0.02  
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]  
Range of exercise prices, lower (in USD per share) 0.00
Range of exercise prices, upper (in USD per share) $ 0.02
Number of outstanding options (in shares) | shares 58,945,159
Weighted-average remaining contractual term of outstanding options 4 years 9 months 25 days
Weighted-average exercise price of outstanding options (in USD per share) $ 0.00
Number of exercisable options (in shares) | shares 52,555,526
Weighted-average remaining contractual term of exercisable options 4 years 10 months 2 days
Weighted-average exercise price of exercisable options (in USD per share) $ 0.00
$0.02 - $0.05  
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]  
Range of exercise prices, lower (in USD per share) 0.02
Range of exercise prices, upper (in USD per share) $ 0.05
Number of outstanding options (in shares) | shares 23,664,317
Weighted-average remaining contractual term of outstanding options 1 year 4 months 9 days
Weighted-average exercise price of outstanding options (in USD per share) $ 0.01
Number of exercisable options (in shares) | shares 23,146,974
Weighted-average remaining contractual term of exercisable options 1 year 6 months
Weighted-average exercise price of exercisable options (in USD per share) $ 0.01
$0.05 - $0.10  
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]  
Range of exercise prices, lower (in USD per share) 0.05
Range of exercise prices, upper (in USD per share) $ 0.10
Number of outstanding options (in shares) | shares 854,454
Weighted-average remaining contractual term of outstanding options 18 days
Weighted-average exercise price of outstanding options (in USD per share) $ 0.00
Number of exercisable options (in shares) | shares 674,217
Weighted-average remaining contractual term of exercisable options 14 days
Weighted-average exercise price of exercisable options (in USD per share) $ 0.00
$0.10 - $1.00  
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]  
Range of exercise prices, lower (in USD per share) 0.10
Range of exercise prices, upper (in USD per share) $ 1.00
Number of outstanding options (in shares) | shares 25,867,252
Weighted-average remaining contractual term of outstanding options 1 year 9 months 3 days
Weighted-average exercise price of outstanding options (in USD per share) $ 0.10
Number of exercisable options (in shares) | shares 21,424,617
Weighted-average remaining contractual term of exercisable options 1 year 7 months 13 days
Weighted-average exercise price of exercisable options (in USD per share) $ 0.10
$1.00 - $9.74  
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]  
Range of exercise prices, lower (in USD per share) 1.00
Range of exercise prices, upper (in USD per share) $ 9.74
Number of outstanding options (in shares) | shares 3,955,884
Weighted-average remaining contractual term of outstanding options 3 months 14 days
Weighted-average exercise price of outstanding options (in USD per share) $ 0.09
Number of exercisable options (in shares) | shares 2,590,016
Weighted-average remaining contractual term of exercisable options 2 months 19 days
Weighted-average exercise price of exercisable options (in USD per share) $ 0.07