Maintenance and professional services related costs of revenue increased $0.8 million due to a full year of cost of revenues recognized on the acquisition of OpenNMS. The increase in amortization of developed technologies of $0.2 million was also attributed to the acquisition of OpenNMS. Other cost of revenue decreased $0.9 million and was primarily attributable to lower amortization of internal-use software that was impaired in December of 2020. Selling, General and Administrative (Dollars in thousands) Year Ended December 31, Period-To-Period Change 2021 2020 2021 vs. 2020 Amount Amount Amount Percentage Selling, general and administrative $ 52,092 $ 48,534 $ 3,558 7.3 % Selling, general and administrative expenses increased $3.6 million, or 7.3%, from $48.5 million for the year ended December 31, 2020 to $52.1 million for the year ended December 31, 2021. The increase was primarily attributable to $3.8 million of higher costs due to a full year of selling, general and administrative expenses recognized from OpenNMS, which was acquired in July of 2020. These increases were partially offset by a $0.6 million decline in personnel related costs in other product lines. Research and Development (Dollars in thousands) Year Ended December 31, Period-To-Period Change 2021 2020 2021 vs. 2020 Amount Amount Amount Percentage Research and development $ 19,707 $ 17,274 $ 2,433 14.1 % Research and development expenses increased $2.4 million, or 14.1%, from $17.3 million for the year ended December 31, 2020 to $19.7 million for the year ended December 31, 2021. The increase was primarily attributable to $2.2 million of higher costs due to a full year of research and development expenses recognized on the acquisition of OpenNMS. Amortization of Acquisition-related Assets (Dollars in thousands) Year Ended December 31, Period-To-Period Change 2021 2020 2021 vs. 2020 Amount Amount Amount Percentage Amortization of acquisition-related assets $ 3,942 $ 3,676 $ 266 7.2 % Amortization of acquisition-related assets increased $0.3 million, or 7.2%, from $3.7 million for the year ended December 31, 2020 to $3.9 million for the year ended December 31, 2021, as a result of a full year of amortization recognized on the acquisition of OpenNMS. - 84 -
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