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STOCK-BASED COMPENSATION - Stock-Based Compensation Related to Stock-Based Awards to Employees (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]        
Total stock-based compensation $ 433 $ 111 $ 1,144 $ 281
Research and development        
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]        
Total stock-based compensation 225 68 645 158
Sales and marketing        
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]        
Total stock-based compensation 38 21 114 66
General and administrative        
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]        
Total stock-based compensation $ 170 $ 22 $ 385 $ 57