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Equity Incentive Plans - Summary of Share-Based Compensation Expense By Function (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Total stock-based compensation expense $ 1,899 $ 165 $ 3,107 $ 291
Cost of Goods Sold        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Total stock-based compensation expense 22 6 46 11
Research and Development        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Total stock-based compensation expense 169 28 307 51
Selling, General and Administrative        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Total stock-based compensation expense $ 1,708 $ 131 $ 2,754 $ 229