As of September 30, 2022, the weighted-average amortization period for customer relationships and developed technology was 11.2 years, trade names was 4.2 years, backlog was 0.2 years and patents and FCC licenses was 7.5 years. Amortization expense related to intangible assets for the three and nine months ended September 30, 2022 was $1,721 and $5,199, respectively, and for the three and nine months ended September 30, 2021 was $21 and $68, respectively.

No impairment charges were recognized for the three and nine months ended September 30, 2022 and 2021. The patents asset balance as of September 30, 2022 and December 31, 2021 includes $57 and $196, respectively, of capitalized patent costs, that will begin amortization upon the issuance of an official patent right to the Company.