Quarterly report pursuant to Section 13 or 15(d)

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

v3.21.1
STOCK BASED COMPENSATION - Stock-based Compensation Expense (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Total stock based compensation expenses $ 2,217 $ 1,259
Research and development    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Total stock based compensation expenses 916 713
General and administrative expenses    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Total stock based compensation expenses 839 237
Sales and marketing expense    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Total stock based compensation expenses 345 209
Cost of sales    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Total stock based compensation expenses $ 117 $ 100