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Accumulated Other Comprehensive Income (Loss) (Tables) | 12 Months Ended
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Dec. 31, 2017
Changes in Accumulated Other Comprehensive Income (Loss) | Changes in accumulated other comprehensive income (loss) consisted of the following for the years ended December 31, 2017 and 2016 (in thousands):
|  | Unrealized gain (loss) on investments |  |  | Foreign currency translation adjustment |  |  | Total |
Balance as of December 31, 2015 |  | $ | (11 | ) |  | $ | (8,555 | ) |  | $ | (8,566 | )
Other comprehensive income (loss) |  |  | 6 |  |  |  | (5,189 | ) |  |  | (5,183 | )
Balance as of December 31, 2016 |  |  | (5 | ) |  |  | (13,744 | ) |  |  | (13,749 | )
Other comprehensive income (loss) |  |  | 5 |  |  |  | 7,381 |  |  |  | 7,386 |
Balance as of December 31, 2017 |  | $ | — |  |  | $ | (6,363 | ) |  | $ | (6,363 | )

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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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