Note 9. Intangible Assets, net

Intangible assets, net consist of customer contracts purchased as part of the GTC acquisition in 2014.

Amortization of customer contracts is included in depreciation and amortization in the accompanying Condensed Consolidated Statements of Comprehensive Loss. For the six months ended June 30, 2023 and 2022, the Company recognized amortization expense of $12,500 and $12,500, respectively. Future amortization of intangible assets is as follows: