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Stock-Based Compensation - Stock-Based Compensation (Details) - USD ($)
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]    
Total stock-based compensation $ 3,234,000 $ 1,765,000
Research and development expenses    
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]    
Total stock-based compensation 491,000 355,000
Selling, general and administrative expenses    
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]    
Total stock-based compensation $ 2,743,000 $ 1,410,000