v3.26.1
Operating Segments and Enterprise-Wide Information - Operating Results by Segment (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 27, 2026
Jun. 28, 2025
Jun. 27, 2026
Jun. 28, 2025
Segment Reporting [Line Items]        
Revenues $ 258,242 $ 195,798 $ 484,386 $ 367,154
Cost of revenues 127,320 122,860 266,670 229,693
Gross profit $ 130,922 $ 72,938 $ 217,716 $ 137,461
Gross margin 50.70% 37.30% 44.90% 37.40%
Research and development $ 31,099 $ 28,793 $ 61,879 $ 56,593
Selling Expense 14,942 11,974 27,818 25,001
Marketing Expense 5,150 4,807 10,227 9,254
Net Contribution 79,731 27,364 117,792 46,613
General and Administrative Expense 17,073 14,701 31,412 30,681
Factory start-up costs 4,859 357 11,933 357
Operating Income (Loss) 57,799 12,306 74,447 15,575
Other income (expense), net 212 (6) 653 884
Income before income taxes and equity investment 60,694 14,942 79,957 22,418
Interest income, net 2,683 2,642 4,857 5,959
Systems        
Segment Reporting [Line Items]        
Revenues 48,547 33,690 76,434 68,526
Probe Cards        
Segment Reporting [Line Items]        
Revenues 209,695 162,108 407,952 298,628
Probe Cards | Systems        
Segment Reporting [Line Items]        
Revenues 0 0 0 0
Systems        
Segment Reporting [Line Items]        
Revenues 48,547 33,690 76,434 68,526
Systems | Systems        
Segment Reporting [Line Items]        
Revenues 48,547 33,690 76,434 68,526
Operating segments | Probe Cards        
Segment Reporting [Line Items]        
Revenues 209,695 162,108 407,952 298,628
Cost of revenues 95,639 100,040 193,765 184,945
Gross profit $ 114,056 $ 62,068 $ 214,187 $ 113,683
Gross margin 54.40% 38.30% 52.50% 38.10%
Research and development $ 22,961 $ 20,974 $ 44,733 $ 42,030
Selling Expense 8,601 7,181 16,324 13,747
Marketing Expense 1,869 1,598 3,491 3,178
Net Contribution 80,625 32,315 149,639 54,728
Operating segments | Systems        
Segment Reporting [Line Items]        
Revenues 48,547 33,690    
Cost of revenues 24,984 20,419 42,269 39,740
Gross profit $ 23,563 $ 13,271 $ 34,165 $ 28,786
Gross margin 48.50% 39.40% 44.70% 42.00%
Research and development $ 6,205 $ 5,261 $ 11,436 $ 9,229
Selling Expense 4,910 3,424 8,748 7,084
Marketing Expense 1,924 1,882 3,744 3,623
Net Contribution 10,524 2,704 10,237 8,850
Operating segments | Corporate and Other        
Segment Reporting [Line Items]        
Revenues     0 0
Gross profit     (30,636) (5,008)
Corporate and Other        
Segment Reporting [Line Items]        
Revenues 0 0    
Cost of revenues 6,697 2,401 30,636 5,008
Gross profit (6,697) (2,401)    
Research and development 1,933 2,558 5,710 5,334
Selling Expense 1,431 1,369 2,746 4,170
Marketing Expense 1,357 1,327 2,992 2,453
Net Contribution $ (11,418) $ (7,655) $ (42,084) $ (16,965)