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Accumulated Other Comprehensive Income
 12 Months Ended
Dec. 31, 2019
Equity [Abstract]  
Accumulated Other Comprehensive Income Accumulated Other Comprehensive Income
The following table summarizes the activity of accumulated other comprehensive income during the years ended December 31, 2019, 2018 and 2017 (in thousands):
Accumulated translation adjustmentAccumulated unrealized holding gains (losses) on available-for-sale securitiesAccumulated other comprehensive income
Balance at December 31, 2016$298  $(7) $291  
Other comprehensive loss(159) (60) (219) 
Balance at December 31, 2017139  (67) 72  
Other comprehensive income26  —  26  
Balance at December 31, 2018165  (67) 98  
Other comprehensive income13  176  189  
Balance at December 31, 2019$178  $109  $287