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Stock-Based Compensation (Tables)
 6 Months Ended
Jun. 30, 2022
Stock-Based Compensation [Abstract]  
Classification of Stock-Based Compensation Expense

The following table presents the classification of stock-based compensation expense recognized for the periods below:

   
Three months ended
June 30,
    
Six months ended
June 30,
  
(in thousands)
  
2022
    
2021
    
2022
    
2021
  
Selling, general and administrative expense
  
$
211
    
$
350
    
$
425
    
$
677
  
Research and development expense
    
25
      
31
      
52
      
59
  
Total stock-based compensation expense
  
$
236
    
$
381
    
$
477
    
$
736