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Accumulated Other Comprehensive Income (Tables)
12 Months Ended
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