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Stock-Based Compensation (Tables)
3 Months Ended
Mar. 31, 2021
Stock-Based Compensation Expense Stock-based compensation expense was as follows (in thousands):
 
     Three Months Ended
March 31,
 
     2021      2020  
Cost of revenues
   $ 228      $ 119  
Selling, general and administrative
     853        437  
Research and development
     490        154  
    
 
 
    
 
 
 
Total stock-based compensation
   $ 1,571      $ 710  
    
 
 
    
 
 
 
Summary of Compensation Expense by Type of Award
Compensation expense by type of award was as follows (in thousands):
 
     Three Months Ended
March 31,
 
     2021      2020  
Stock options
   $ 1,331      $ 506  
ESPP
     240        204  
    
 
 
    
 
 
 
Total stock-based compensation
   $ 1,571      $ 710