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Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Apr. 01, 2017
Accumulated Other Comprehensive Loss [Roll Forward]    
Balance at beginning of period $ 144,963  
Other comprehensive income (loss)   $ 57
Balance at end of period 138,039  
Unrealized Gains and Losses on Available-for-Sale Marketable Securities    
Accumulated Other Comprehensive Loss [Roll Forward]    
Balance at beginning of period   (6)
Other comprehensive income (loss)   (4)
Balance at end of period   (10)
Foreign Currency Translation Adjustments    
Accumulated Other Comprehensive Loss [Roll Forward]    
Balance at beginning of period (169) (650)
Other comprehensive income (loss) 279 61
Balance at end of period $ 110 (589)
Total    
Accumulated Other Comprehensive Loss [Roll Forward]    
Balance at beginning of period   (656)
Balance at end of period   $ (599)