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Accumulated Other Comprehensive Income (Tables) | 12 Months Ended
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Dec. 31, 2017
Equity [Abstract] |
Schedule of Accumulated Other Comprehensive Income | The following table summarizes the activity of accumulated other comprehensive income during the years ended December 31, 2017, 2016 and 2015 (in thousands):
|  | Accumulated translation adjustment |  | Accumulated unrealized holding gains (losses) on available-for-sale securities |  | Accumulated other comprehensive income
Balance at December 31, 2014 |  | $ | 147 |  | $ | — |  | $ | 147
Other comprehensive income (loss) |  | 133 |  | (39) |  | 94
Balance at December 31, 2015 |  | 280 |  | (39) |  | 241
Other comprehensive income |  | 18 |  | 32 |  | 50
Balance at December 31, 2016 |  | 298 |  | (7) |  | 291
Other comprehensive loss |  | (159) |  | (60) |  | (219)
Balance at December 31, 2017 |  | $ | 139 |  | $ | (67) |  | $ | 72

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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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