The following table summarizes changes in goodwill balance:

 

Intangible assets consisted of the following:

 

In conjunction with the exactEarth acquisition, the Company acquired intangible assets for a total of $43,621 in November 2021. As of December 31, 2021, the weighted-average amortization period for Customer relationships and Developed technology was 11.9 years, Trade names was 4.9 years, Backlog was 0.9 years and patents and FCC licenses was 7.6 years. Amortization expense related to intangible assets for the years ended December 31, 2021 and 2020, was $666 and $81, respectively.

During the year ended December 31, 2021, the Company recognized impairment charges of $91 for intangible assets relating to patent costs. No impairment charges were recognized for the year ended December 31, 2020. The patents asset balance as of December 31, 2021 and 2020 includes $196 and $284 of capitalized patent costs, respectively, that will begin amortization upon the issuance of an official patent right to the Company.

As of December 31, 2021, the expected future amortization expense of intangible assets is as follows: