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Stock Option Plan - Stock-Based Compensation Expense (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock-based compensation expense $ 431 $ 12
Cost of revenue    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock-based compensation expense 6 1
Selling, general and administrative    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock-based compensation expense 422 10
Research and development    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock-based compensation expense $ 3 $ 1