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Stock-Based Compensation (Recognized Stock-Based Compensation Expense) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]        
Stock-based compensation expense $ 474 $ 31 $ 1,159 $ 95
Unrecognized compensation expense 6,300   $ 6,300  
Weighted average period     3 years 6 months  
Selling, general & administrative        
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]        
Stock-based compensation expense 353 20 $ 830 62
Research & development        
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]        
Stock-based compensation expense 115 11 319 32
Cost of goods sold        
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]        
Stock-based compensation expense $ 6 $ 0 $ 10 $ 1