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Accumulated Other Comprehensive Loss (Tables) | 3 Months Ended
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Mar. 31, 2018
Equity [Abstract] |
Accumulated other comprehensive income details | The table below summarizes the changes in accumulated other comprehensive income (loss) by component for the periods indicated (in thousands):
|  | Three Months Ended
|  | March 31, 2018 |  | April 1, 2017
|  | Foreign Currency Translation Adjustments |  | Unrealized Gains and Losses on Available-for-Sale Marketable Securities |  | Foreign Currency Translation Adjustments |  | Total
Balance at beginning of period |  | $ | (169 | ) |  | $ | (6 | ) |  | $ | (650 | ) |  | $ | (656 | )
Other comprehensive income (loss) |  | 279 |  |  | (4 | ) |  | 61 |  |  | 57 |
Balance at end of period |  | $ | 110 |  |  | $ | (10 | ) |  | $ | (589 | ) |  | $ | (599 | )

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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669686-108580 + Details
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