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Stock Option Plan - Stock-Based Compensation Expense (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation expense $ 1,440 $ 1,285 $ 2,816 $ 2,197
Costs of revenue        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation expense 59 61 103 72
Selling, general and administrative        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation expense 1,203 1,049 2,321 1,840
Research and development        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation expense $ 178 $ 175 $ 392 $ 285