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Employee benefit plan (Details) - USD ($)
 12 Months Ended
Jan. 01, 2021
Dec. 31, 2024
Dec. 31, 2023
Retirement Benefits [Abstract]      
Minimum service period 3 months    
Employee base pay matched at 100% 3.00%    
Employer matching contribution of employee's first 3% of base pay 100.00%    
Employer matching contribution of employee's next 2% of base pay after first 3% of base pay matched 50.00%    
Employee base pay matched at 50% after employee's first 3% of base pay matched 2.00%    
Maximum annual contributions per employee 4.00%    
Vesting percentage with respect to employer contributions after completing six years of service 100.00%    
Service term required for full vesting 6 years    
Total contributions paid   $ 329,463 $ 241,466