General form of registration statement for all companies including face-amount certificate companies

CONVERTIBLE PREFERRED STOCK AND STOCKHOLDERS' EQUITY - Stock-based Compensation Expense (Details)

v3.20.4
CONVERTIBLE PREFERRED STOCK AND STOCKHOLDERS' EQUITY - Stock-based Compensation Expense (Details) - USD ($)
$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total stock based compensation expenses $ 4,228 $ 3,430 $ 5,215 $ 2,965
Research and development        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total stock based compensation expenses 2,176 1,501 2,713 1,696
Sales and marketing expense        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total stock based compensation expenses 715 1,020 1,373 567
General and administrative expenses        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total stock based compensation expenses 1,070 668 941 658
Cost of sales        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total stock based compensation expenses $ 267 $ 241 $ 188 $ 44