At September 30, 2016 and December 31, 2015, intangible assets consisted of the following (in thousands):

With respect to our trademark and brand name, we continue to market products, release new products and product extensions and maintain and promote these trademarks and brand name in the marketplace through legal registration and such methods as advertising, medical education and trade shows. It is our belief that these trademarks and brand names will generate cash flow for an indefinite period of time. Therefore, we believe our trademarks and brand name intangible assets are not impaired as of September 30, 2016.

Amortization of intangibles, which is included in depreciation and amortization in the accompanying statements of cash flows, was approximately $81,000 during the nine month periods ended September 30, 2016 and 2015.