The Company’s intangible assets consist of patents, mainly acquired in the acquisition of Belgian Volition. The patents and intellectual property are being amortized over the assets’ estimated useful lives, which range from 8 to 20 years.

During the six-month periods ended June 30, 2019 and June 30, 2018, the Company recognized $43,778 and $46,863, respectively, in amortization expense.

The Company amortizes the long-lived assets on a straight-line basis with terms ranging from 8 to 20 years. The annual estimated amortization schedule over the next five years is as follows:

The Company periodically reviews its long-lived assets to ensure that their carrying value does not exceed their fair market value. The Company carried out such a review in accordance with ASC 360 as of December 31, 2018. The result of this review confirmed that the ongoing value of the patents was not impaired as of December 31, 2018.