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EQUITY INCENTIVE PLAN, Stock-Based Compensation Expense (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Stock-Based Compensation Expense [Abstract]        
Stock-based compensation expense $ 7,396 $ 493 $ 17,840 $ 1,601
Research and Development [Member]        
Stock-Based Compensation Expense [Abstract]        
Stock-based compensation expense 1,520 355 4,343 1,217
General and Administrative [Member]        
Stock-Based Compensation Expense [Abstract]        
Stock-based compensation expense 5,626 64 12,918 160
Sales and Marketing [Member]        
Stock-Based Compensation Expense [Abstract]        
Stock-based compensation expense $ 250 $ 74 $ 579 $ 224