Quarterly report pursuant to Section 13 or 15(d)

STOCK-BASED COMPENSATION - Schedule of Stock-based Compensation (Details)

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STOCK-BASED COMPENSATION - Schedule of Stock-based Compensation (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Allocation of stock-based compensation expense        
Stock compensation expense $ 1,928 $ 1,473 $ 6,232 $ 4,463
Research and development        
Allocation of stock-based compensation expense        
Stock compensation expense 1,059 645 3,116 2,163
Sales, marketing and administration        
Allocation of stock-based compensation expense        
Stock compensation expense $ 869 $ 828 $ 3,116 $ 2,300