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Stock-Based Compensation (Tables)
3 Months Ended
Mar. 31, 2023
Stock-Based Compensation Expense Stock-based compensation expense was as follows (in thousands):
     Three Months Ended
March 31,
 
     2023      2022  
Cost of revenues
   $ 486      $ 251  
Selling, general and administrative
     1,520        1,207  
Research and development
     811        536  
    
 
 
    
 
 
 
Total stock-based compensation
   $ 2,817      $ 1,994  
    
 
 
    
 
 
 
Summary of Compensation Expense by Type of Award
Compensation expense by type of award was as follows (in thousands):
 
     Three Months Ended
March 31,
 
     2023      2022  
Stock options
   $ 2,496      $ 1,759  
ESPP
     321        235  
    
 
 
    
 
 
 
Total stock-based compensation
   $ 2,817      $ 1,994