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Stock Option Plan - Stock-Based Compensation Expense (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock-based compensation expense $ 986 $ 1,376
Costs of revenue    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock-based compensation expense 53 44
Selling, general and administrative    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock-based compensation expense 831 1,118
Research and development    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock-based compensation expense $ 102 $ 214