Annual report pursuant to Section 13 and 15(d)

STOCK-BASED COMPENSATION - Options and RSUs (Details)

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STOCK-BASED COMPENSATION - Options and RSUs (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Number of Shares      
Granted (in shares) 233,750    
Additional disclosures      
Total unrecognized compensation costs $ 12,900    
Weighted-average recognition period of unrecognized compensation cost 2 years 9 months 7 days    
Employee stock options and Restricted Stock Units      
Shares Available For Grant      
Outstanding, beginning of period (in shares) 14,218,190    
Authorized for grant (in shares) 825,000    
Granted (in shares) (7,231,731)    
Cancelled and forfeited (in shares) 2,903,853    
Outstanding, end of period (in shares) 10,715,312 14,218,190  
Employee stock options      
Number of Shares      
Outstanding, beginning of period (in shares) 27,260,463    
Granted (in shares) 6,997,981    
Exercised (in shares) (1,353,426)    
Cancelled and forfeited (in shares) (2,896,353)    
Outstanding, end of period (in shares) 30,008,665 27,260,463  
Vested and expected to vest (in shares) 28,017,415    
Exercisable (in shares) 19,647,126    
Weighted-Average Exercise Price      
Outstanding, beginning of period (in dollars per share) $ 3.05    
Granted (in dollars per share) 3.65    
Exercised (in dollars per share) 2.49    
Cancelled and forfeited (in dollars per share) 3.95    
Outstanding, end of period (in dollars per share) 3.13 $ 3.05  
Vested and expected to vest (in dollars per share) 3.13    
Exercisable (in dollars per share) $ 3.23    
Weighted Intrinsic Value (in thousands)      
Outstanding (in thousands) $ 6,812    
Vested and Expected to Vest (in thousands) 6,611    
Exercisable (in thousands) $ 4,819    
Number of Shares      
Granted (in shares) 6,997,981 8,462,090 7,457,575
Additional disclosures      
Number of shares vested 4,765 4,386,910 4,442,936
Shares vested, weighted average exercise price $ 2.67 $ 2.41 $ 3.26
Aggregate intrinsic value of options exercised $ 2,100 $ 500 $ 10
Restricted stock units      
Number of Shares      
Outstanding, beginning of period (in shares)    
Cancelled and forfeited (in shares) (7,500)    
Outstanding, end of period (in shares) 226,250  
Weighted-Average Grant Date Fair Value      
Outstanding, beginning of period (in dollars per share)    
Granted (in dollars per share) 3.67    
Cancelled and forfeited (in dollars per share) 3.68    
Outstanding, end of period (in dollars per share) $ 3.67  
Performance shares      
Number of Shares      
Outstanding, end of period (in shares) 1,991,250    
Additional disclosures      
Total unrecognized compensation costs $ 4,000