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Stock Option Plan - Stock-Based Compensation Expense (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation expense $ 560 $ 978 $ 1,113 $ 1,964
Costs of revenue        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation expense 39 63 56 116
Selling, general and administrative        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation expense 465 874 944 1,705
Research and development        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation expense $ 56 $ 41 $ 113 $ 143