v3.25.1
Equity Incentive Plan (Tables)
12 Months Ended
Dec. 31, 2024
Share-based Payment Arrangement [Abstract]  
Summary of Stock Option and Restricted Stock Units Activity
The following is a summary of the 2015 Plan, which includes restricted stock units:
 
    
Unit

(in Thousands)
 
Available for grant at January 1, 2022
     10,433  
Restricted stock units granted
     (902
Restricted stock units forfeited
     49  
  
 
 
 
Available for grant at December 31, 2022
     9,580  
Restricted stock units granted
     (624
Restricted stock units forfeited
     51  
  
 
 
 
Available for grant at December 31, 2023
     9,007  
Restricted stock units granted
     (1,225
Restricted stock units forfeited
     18  
  
 
 
 
Available for grant at December 31, 2024
     7,800  
  
 
 
 
Summary of Restricted Stock Units and Changes
A summary of the status of restricted stock units and changes is as follows:
 
    
Number of
Non-vested

Stock Units
(in Thousands)
    
Weighted
Average
Grant
Date
Fair
Value
(US$)
    
Weight
Average
Remaining
Recognition
Period
(Years)
 
Non-vested
at January 1, 2022
     2,310        17.37        1.57  
Restricted stock units granted
     902        19.56     
Restricted stock units vested
     (1,186      17.61     
Restricted stock units forfeited
     (49      17.18     
  
 
 
    
 
 
    
Non-vested
at December 31, 2022
     1,977        17.89        0.66  
Restricted stock units granted
     624        13.51     
Restricted stock units vested
     (1,460      18.36     
Restricted stock units forfeited
     (51      16.38     
  
 
 
    
 
 
    
Non-vested
at December 31, 2023
     1,090        15.00        0.13  
Restricted stock units granted
     1,225        15.68     
Restricted stock units vested
     (1,089      14.94     
Restricted stock units forfeited
     (18      15.26     
  
 
 
    
 
 
    
Non-vested
at December 31, 2024
     1,208        15.68        0.25  
  
 
 
    
 
 
    
Stock-based Compensation Expense
The following table shows total stock-based compensation expense included in the Consolidated Statements of Income for the years ended December 31, 2022, 2023 and 2024.
 
    
Year Ended December 31
 
    
2022
    
2023
    
2024
 
    
US$
    
US$
    
US$
 
Cost of sales
     597        406        311  
Research and development
     18,678        11,709        11,284  
Sales and marketing
     2,736        1,858        1,954  
General and administrative
     4,650        3,574        3,407  
  
 
 
    
 
 
    
 
 
 
     26,661        17,547        16,956