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Other comprehensive income (loss) and accumulated other comprehensive items (Tables) | 9 Months Ended
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Sep. 30, 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 and nine months ended September 30, 2018:
|  | Unrealized Gains/(Losses) On Marketable Securities, net of tax |  | Foreign Currency Translation |  | Total Accumulated Other Comprehensive Items
Balance at June 30, 2018 |  | $ | (61 | ) |  | $ | 1,916 |  |  | $ | 1,855 |
Other comprehensive income (loss) before reclassifications |  | 33 |  |  | (260 | ) |  | (227 | )
Amounts reclassified from other comprehensive items |  | — |  |  | — |  |  | — |
Other comprehensive income (loss) |  | 33 |  |  | (260 | ) |  | (227 | )
Balance at September 30, 2018 |  | $ | (28 | ) |  | $ | 1,656 |  |  | $ | 1,628 |
|  | 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 before reclassifications |  | (50 | ) |  | (2,291 | ) |  | (2,341 | )
Amounts reclassified from other comprehensive items |  | — |  |  | — |  |  | — |
Other comprehensive loss |  | (50 | ) |  | (2,291 | ) |  | (2,341 | )
Balance at September 30, 2018 |  | $ | (28 | ) |  | $ | 1,656 |  |  | $ | 1,628 |

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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=114867106&loc=SL7669686-108580 + Details
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