Registration of securities issued in business combination transactions

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

v3.21.2
STOCK BASED COMPENSATION - Stock-based Compensation Expense (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Sep. 28, 2020
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Total stock based compensation expenses $ 1,800 $ 3,999 $ 1,074 $ 6,216 $ 2,333 $ 8,006 $ 5,215
Research and development              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Total stock based compensation expenses   1,838 569 2,755 1,283 3,276 2,713
General and administrative expenses              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Total stock based compensation expenses   1,355 217 2,194 454 3,464 941
Sales and marketing expense              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Total stock based compensation expenses   577 213 921 421 894 1,373
Cost of sales              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Total stock based compensation expenses   $ 229 $ 75 $ 346 $ 175 $ 372 $ 188