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Changes in Accumulated Other Comprehensive Income by Component (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Oct. 01, 2016
Oct. 03, 2015
Oct. 01, 2016
Oct. 03, 2015
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance     $ 75,997  
Other comprehensive income (loss) before reclassification $ (33) $ (116) 46 $ (126)
Amounts reclassified from other comprehensive income 0 0 0 0
Net current-period other comprehensive income (loss) (33) (116) 46 (126)
Ending balance 69,862   69,862  
Foreign currency        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance 474 585 452 620
Other comprehensive income (loss) before reclassification (17) (115) 5 (150)
Amounts reclassified from other comprehensive income 0 0 0 0
Net current-period other comprehensive income (loss) (17) (115) 5 (150)
Ending balance 457 470 457 470
Unrealized holding gains on available-for-sale investments        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance 17 24 (40) (1)
Other comprehensive income (loss) before reclassification (16) (1) 41 24
Amounts reclassified from other comprehensive income 0 0 0 0
Net current-period other comprehensive income (loss) (16) (1) 41 24
Ending balance 1 23 1 23
Accumulated other comprehensive income        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance 491 609 412 619
Amounts reclassified from other comprehensive income 0 0 0 0
Ending balance $ 458 $ 493 $ 458 $ 493