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Accumulated Other Comprehensive Loss | 6 Months Ended
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Jun. 30, 2018
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] |
Accumulated Other Comprehensive Loss | Accumulated Other Comprehensive Loss The changes in accumulated other comprehensive loss by component were as follows:
| Three Months Ended |  | Six Months Ended
| June 30, |  | June 30,
| 2018 |  | 2017 |  | 2018 |  | 2017
Foreign currency translation |  |  |  |  |  |  |
Balance at beginning of period | $ | (356 | ) |  | $ | (1,458 | ) |  | $ | (772 | ) |  | $ | (1,574 | )
Other comprehensive loss: |  |  |  |  |  |  |
Foreign currency translation adjustments (1) | (594 | ) |  | 380 |  |  | (178 | ) |  | 496 |
Balance at end of period | $ | (950 | ) |  | $ | (1,078 | ) |  | $ | (950 | ) |  | $ | (1,078 | )
Available-for-sale marketable securities |  |  |  |  |  |  |
Balance at beginning of period | $ | 3 |  |  | $ | 7 |  |  | $ | 4 |  |  | $ | 6 |
Other comprehensive income: |  |  |  |  |  |  |
Net unrealized holding gain (loss) (2) | (2 | ) |  | — |  |  | (3 | ) |  | 1 |
Balance at end of period | $ | 1 |  |  | $ | 7 |  |  | $ | 1 |  |  | $ | 7 |
Total accumulated other comprehensive loss | $ | (949 | ) |  | $ | (1,071 | ) |  | $ | (949 | ) |  | $ | (1,071 | )
(1) | In all periods presented, there were no tax impacts related to rate changes and no amounts were reclassified to earnings.
(2) | In all periods presented, there were no realized holding gains or losses and therefore no amounts were reclassified to earnings.

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- Definition The entire disclosure for comprehensive income, which includes, but is not limited to, 1) the amount of income tax expense or benefit allocated to each component of other comprehensive income, including reclassification adjustments, 2) the reclassification adjustments for each classification of other comprehensive income and 3) the ending accumulated balances for each component of comprehensive income. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -URI http://asc.fasb.org/topic&trid=2134417 + Details
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