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Other comprehensive income (loss) and accumulated other comprehensive items (Tables) | 6 Months Ended
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Jun. 30, 2017
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 six months ended June 30, 2017:
|  | Unrealized Gains/(Losses) On Marketable Securities, net of tax |  | Foreign Currency Translation |  | Total Accumulated Other Comprehensive Items
Balance at March 31, 2017 |  | $ | (225 | ) |  | $ | (651 | ) |  | $ | (876 | )
Other comprehensive (loss) income before reclassifications |  | (9 | ) |  | 2,884 |  |  | 2,875 |
Amounts reclassified from other comprehensive items |  | — |  |  | — |  |  | — |
Other comprehensive (loss) income |  | (9 | ) |  | 2,884 |  |  | 2,875 |
Balance at June 30, 2017 |  | $ | (234 | ) |  | $ | 2,233 |  |  | $ | 1,999 |
|  | Unrealized Gains/(Losses) On Marketable Securities, net of tax |  | Foreign Currency Translation |  | Total Accumulated Other Comprehensive Items
Balance at December 31, 2016 |  | $ | (203 | ) |  | $ | (1,282 | ) |  | $ | (1,485 | )
Other comprehensive (loss) income before reclassifications |  | (31 | ) |  | 3,515 |  |  | 3,484 |
Amounts reclassified from other comprehensive items |  | — |  |  | — |  |  | — |
Other comprehensive (loss) income |  | (31 | ) |  | 3,515 |  |  | 3,484 |
Balance at June 30, 2017 |  | $ | (234 | ) |  | $ | 2,233 |  |  | $ | 1,999 |

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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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