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STOCK-BASED COMPENSATION - Stock-based compensation expense (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]        
Total stock-based compensation $ 11,890 $ 10,671 $ 24,798 $ 14,968
Other operating expenses        
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]        
Total stock-based compensation 2,606 2,427 5,663 3,626
Research and development expenses        
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]        
Total stock-based compensation 2,387 1,153 4,600 2,052
Sales and marketing expenses        
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]        
Total stock-based compensation 3,642 3,539 7,407 4,579
General and administrative expenses        
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]        
Total stock-based compensation $ 3,255 $ 3,552 $ 7,128 $ 4,711