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Other comprehensive income (loss) and accumulated other comprehensive items (Tables) | 3 Months Ended
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Mar. 31, 2018
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract] |
Summary of other comprehensive income (loss) and the changes in accumulated other comprehensive items | The following tables summarize other comprehensive income (loss) and the changes in accumulated other comprehensive items for the three months ended March 31, 2018:
|  | Unrealized Gains/(Losses) On Marketable Securities, net of tax |  | Foreign Currency Translation |  | Total Accumulated Other Comprehensive Items
Balance at December 31, 2017 |  | $ | 22 |  |  | $ | 3,947 |  |  | $ | 3,969 |
Other comprehensive (loss) income before reclassifications |  | (123 | ) |  | 1,107 |  |  | 984 |
Amounts reclassified from other comprehensive items |  | — |  |  | — |  |  | — |
Other comprehensive (loss) income |  | (123 | ) |  | 1,107 |  |  | 984 |
Balance at March 31, 2018 |  | $ | (101 | ) |  | $ | 5,054 |  |  | $ | 4,953 |

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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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