11. GOODWILL & INTANGIBLE ASSETS

The carrying amount of goodwill at September 30, 2022 and December 31, 2021 was $365.3 million and $639.3 million respectively, and has been recorded in connection with the Company’s acquisitions. The goodwill activity is as follows (in thousands):

​

​

At June 30, 2022, a quantitative interim goodwill impairment assessment was performed due to further sustained declines in the Company’s and comparable companies’ stock prices in the six months ended June 30, 2022. At September 30, 2022, there was no incremental goodwill impairment recorded.

​

The Company estimated the fair value using the discounted cash flow method under the income approach. The significant assumptions used in the valuation include revenue growth rates, future gross profit margins and operating expenses used to calculate projected future cash flows, determination of the weighted average cost of capital, and future economic and market conditions. The terminal value is based on an exit revenue multiple which requires significant assumptions regarding the selections of appropriate multiples that consider relevant market trading data. The Company bases its estimates and assumptions on its knowledge of the

additive manufacturing industry, recent performance, expectations of future performance and other assumptions the Company believes to be reasonable.

​

The Company determined that the estimated fair value of the reporting unit was less than its carrying amount. During the three and nine months ended September 30, 2022, the Company recorded goodwill impairment charges of $0 and $229.5 million, respectively, in the condensed consolidated statements of operations.

​

Intangible assets consisted of the following (in thousands):

​

​

​

During the three and nine months ended September 30, 2022 and 2021, the Company recognized the following amortization expense (in thousands):

​

​

The Company expects to recognize the following amortization expense (in thousands):

​