Quarterly report pursuant to Section 13 or 15(d)

STOCK-BASED COMPENSATION - Summary of Stock-based Compensation Expense (Details)

v3.21.2
STOCK-BASED COMPENSATION - Summary of Stock-based Compensation Expense (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]        
Stock-based compensation expense $ 833 $ 1,269 $ 3,680 $ 2,624
Capitalized stock-based compensation 184 73 502 375
Selling and marketing        
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]        
Stock-based compensation expense 22 24 54 71
General and administrative        
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]        
Stock-based compensation expense 117 277 1,587 802
Research and development        
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]        
Stock-based compensation expense $ 694 $ 968 $ 2,039 $ 1,751