6. Goodwill

The following table presents the changes in our goodwill balance (in thousands):


Balance at December 31, 2017	$	17,152
Acquisition		2,332
Foreign currency impact		(49)
Balance at December 31, 2018	$	19,435
Foreign currency impact		30
Balance at December 31, 2019	$	19,465

We have two reporting units, Marketplaces and Media. Goodwill related to our Marketplaces and Media reporting units was $17.1 million and $2.3 million, respectively, as of December 31, 2019.

For the year ended December 31, 2019, we elected to perform a step one impairment analysis as part of our annual goodwill impairment test and determined that there was no impairment charge for the year ended December 31, 2019. The fair value of our reporting units is determined using both an income approach and market approach. As of our assessment date of October 1, 2019, the fair value of our Marketplaces reporting unit exceeded its carrying value by 105%.

For the year ended December 31, 2018, we elected to perform a step one impairment analysis as part of our annual goodwill impairment test and determined that there was no impairment charge for the year ended December 31, 2018. The fair value of our reporting units is determined using both an income approach and market approach. The change in goodwill in 2018 is attributable to the acquisition of Well+Good in June 2018.