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Stock-Based Compensation (Tables)
3 Months Ended
Mar. 31, 2022
Stock-Based Compensation Expense Stock-based compensation expense was as follows (in thousands):
     Three Months Ended  
     March 31,  
     2022      2021  
Cost of revenues
   $ 251      $ 228  
Selling, general and administrative
     1,207        853  
Research and development
     536        490  
    
 
 
    
 
 
 
Total stock-based compensation
   $ 1,994      $ 1,571  
    
 
 
    
 
 
 
Summary of Compensation Expense by Type of Award
Compensation expense by type of award was as follows (in thousands):
 
     Three Months Ended  
     March 31,  
     2022      2021  
Stock options
   $ 1,759      $ 1,331  
ESPP
     235        240  
    
 
 
    
 
 
 
Total stock-based compensation
   $ 1,994      $ 1,571