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Changes in Accumulated Other Comprehensive Income by Component (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Jan. 02, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning balance $ 75,997 $ 98,630
Other comprehensive loss before reclassification (91) (207)
Amounts reclassified from other comprehensive income 0 0
Net current-period other comprehensive loss (91) (207)
Ending Balance 73,266 75,997
Foreign currency    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning balance 452 620
Other comprehensive loss before reclassification (109) (168)
Amounts reclassified from other comprehensive income 0 0
Net current-period other comprehensive loss (109) (168)
Ending Balance 343 452
Unrealized holding gains on available-for-sale investments    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning balance (40) (1)
Other comprehensive loss before reclassification 18 (39)
Amounts reclassified from other comprehensive income 0 0
Net current-period other comprehensive loss 18 (39)
Ending Balance (22) (40)
Accumulated other comprehensive income    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning balance 412 619
Ending Balance $ 321 $ 412