Annual report pursuant to Section 13 and 15(d)

SHARE-BASED COMPENSATION - Activity of Stock Options (Details)

v3.22.1
SHARE-BASED COMPENSATION - Activity of Stock Options (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Stock Options      
Outstanding, beginning balance (in shares) 896,888 1,195,544  
Granted (in shares) 64,736 121,291  
Exercised (in shares) (40,942) (88,706)  
Forfeited (in shares) (46,830) (331,241)  
Expired (in shares) (89,659)    
Outstanding, ending balance (in shares) 784,193 896,888 1,195,544
Vested and expected to vest (in shares) 772,912    
Vested and exercisable (in shares) 496,830    
Weighted-Average Exercise Price      
Outstanding, beginning price (dollars per share) $ 5.22 $ 14.18  
Granted price (dollars per share) 13.81 6.71  
Exercised price (dollars per share) 0.24 0.24  
Forfeited price (dollars per share) 10.65 11.86  
Expired price (dollars per share) 9.43    
Outstanding, ending price (dollars per share) 5.91 $ 5.22 $ 14.18
Vested and expected to vest (dollars per share) 5.85    
Vested and exercisable (dollars per share) $ 5.83    
Weighted-Average Remaining Contractual Term (Years) and Aggregate Intrinsic Value      
Outstanding term 3 years 8 months 4 days 3 years 11 months 15 days 3 years 2 months 15 days
Granted term 9 years 2 months 23 days 3 years 7 months 20 days  
Vested and expected to vest term 3 years 8 months 8 days    
Vested and exercisable term 3 years 7 months 9 days    
Outstanding $ 0 $ 2,889 $ 3,194
Exercised 434 $ 705  
Vested and expected to vest 0    
Vested and exercisable $ 0