software license revenue represented 6 % , 9 % and 10 % of our revenue in 2020 , 2019 and 2018 , respectively . we also generate revenue from the sale of many types of hardware , including video cameras , video recorders , cellular radio modules , thermostats , image sensors , gunshot detection sensors and other peripherals , that enable our solutions . our hardware and other revenue also includes our revenue from the sale of perpetual licenses that provide our customers in the commercial market the right to use our video surveillance software for an indefinite period of time in exchange for a one-time license fee . our hardware and other revenue also includes our revenue from the sale of licenses that provide our customers the right to use our gunshot detection solution in exchange for license fees . hardware and other revenue represented 36 % , 33 % and 31 % of our revenue in 2020 , 2019 and 2018 , respectively . we typically expect hardware and other revenue to fluctuate as a percentage of total revenue . highlights of our financial performance for the periods covered in this annual report include : saas and license revenue increased 17 % to $ 393.3 million in 2020 from $ 337.4 million in 2019. saas and license revenue increased 16 % to $ 337.4 million in 2019 from $ 291.1 million in 2018. total revenue increased 23 % to $ 618.0 million in 2020 from $ 502.4 million in 2019. total revenue increased 19 % to $ 502.4 million in 2019 from $ 420.5 million in 2018. net income increased 44 % to $ 76.7 million in 2020 from $ 53.3 million in 2019. net income increased 148 % to $ 53.3 million in 2019 from $ 21.5 million in 2018. net income attributable to common stockholders increased 45 % to $ 77.9 million in 2020 from $ 53.5 million in 2019. net income attributable to common stockholders increased 149 % to $ 53.5 million in 2019 from $ 21.5 million in 2018. adjusted ebitda , a non-gaap measurement of operating performance , increased to $ 125.3 million in 2020 from $ 108.3 million in 2019. adjusted ebitda increased to $ 108.3 million in 2019 from $ 93.1 million in 2018. please see non-gaap measures below in this section of this annual report for a discussion of the limitations of adjusted ebitda ( a non-gaap measure ) and a reconciliation of adjusted ebitda to net income , the most comparable gaap measure , for the years ended december 31 , 2020 , 2019 and 2018. historical trends within the financial results information about current period and prior period acquisitions that may affect the comparability of our historical financial information is included in item 1. business . in 2018 , we recorded an expense of $ 28.0 million in general and administrative expense , which relates to the agreement reached to settle the legal matter alleging violations of the telephone consumer protection act , or tcpa , which may affect the comparability of our historical financial information . information about the $ 1.7 million of interest recorded within interest income and the $ 6.9 million of gain recorded within other income , net , in 2019 , which relates to promissory note proceeds received from one of our hardware suppliers and proceeds from an acquired promissory note , and may affect the comparability of our historical financial information , is disclosed in the comparison of years ended december 31 , 2020 to december 31 , 2019 section below within item 7 . `` management 's discussion and analysis of financial condition and results of operations . `` information about the $ 24.7 million gain on the sale of an investment recorded in other income , net , in 2020 , which relates to the sale of an investment in one of our platform partners , and may affect the comparability of historical financial information , is disclosed in the comparison of years ended december 31 , 2020 to december 31 , 2019 section below within item 7 . `` management 's discussion and analysis of financial condition and results of operations . 52 geographic areas we believe there is significant opportunity to expand our international business , as 3 % of our total revenue during the year ended december 31 , 2020 originated from customers located outside of north america . our products are currently localized and available in over 40 countries outside of north america . recent developments the covid-19 pandemic disrupted and may continue to disrupt our supply chain for an unknown period of time due to its impact on manufacturing , production and global transportation . the covid-19 pandemic also disrupted and may intermittently continue to disrupt our sales channels due to restrictions on our service providers ' ability to meet with residential and commercial property owners who use our solutions . we have taken precautionary measures intended to help protect our employees , service providers and subscribers , as well as the communities in which we participate , including enabling substantially all of our employees to work remotely . in addition , the covid-19 pandemic resulted in a global slowdown of economic activity and a recession in the united states and the economic situation remains fluid as parts of the economy appear to be recovering while others continue to struggle . while vaccines have been approved for use in the united states and in many other countries , supplies of the vaccine remain limited and it remains difficult to assess or predict the ultimate duration and economic impact of the covid-19 pandemic . prolonged uncertainty with respect to covid-19 could cause further economic slowdown or cause other unpredictable events , each of which could adversely affect our business , results of operations or financial condition . story_separator_special_tag tariffs have subjected certain alarm.com products manufactured overseas to additional import duties of up to 25 % . the amount of the import tariff and the number of products subject to tariffs have changed numerous times based on action by the u.s. administration . approximately one-fifth to one-half of the finished goods hardware products that we sell to our service provider partners are imported from china and could be subject to increased tariffs . while the additional import duties resulted in an increase to our cost of hardware revenue , these import duties had a modest impact on hardware revenue margins . we continue to monitor the changes in tariffs . if tariffs are increased or are expanded to apply to more of our products , such actions may increase our cost of hardware revenue and reduce our hardware revenue margins in the future . 56 operating expenses our operating expenses consist of sales and marketing , general and administrative , research and development and amortization and depreciation expenses . salaries , bonuses , stock-based compensation , benefits and other personnel related costs are the most significant components of each of these expense categories , excluding amortization and depreciation . we include stock-based compensation expense in connection with the grant of stock options and other forms of equity compensation in the applicable operating expense category based on the respective equity award recipient 's function ( sales and marketing , general and administrative or research and development ) . we grew from 1,160 employees as of january 1 , 2020 to 1,404 employees as of december 31 , 2020 , and we expect to continue to hire new employees to support the projected future growth of our business . sales and marketing expense . sales and marketing expense consists primarily of personnel and related expenses for our sales and marketing teams , including salaries , bonuses , stock-based compensation , benefits , travel , and commissions . our sales and marketing teams engage in sales , account management , service provider partner support , advertising , promotion of our products and services and marketing . the number of employees in sales and marketing functions increased from 391 as of january 1 , 2020 to 461 as of december 31 , 2020. we expect to continue to invest in our sales and marketing activities to expand our business both domestically and internationally . we intend to increase the size of our sales force and our service provider partner support team to provide additional support to our existing service provider partner base to drive their productivity in selling our solutions as well as to enroll new service provider partners in north america and in international markets . general and administrative expense . general and administrative expense consists primarily of personnel and related expenses for our administrative , legal , human resources , finance and accounting personnel , including salaries , bonuses , stock-based compensation , benefits and other personnel costs . additional expenses included in this category are legal costs , including those that are incurred to defend and license our intellectual property , as well as non-personnel costs , such as travel related expenses , rent , subcontracting and professional fees , audit fees , tax services , and insurance expenses . also included in general and administrative expenses are credit losses and acquisition-related expenses , which consist primarily of legal , accounting and professional service fees directly related to acquisitions and valuation gains or losses on acquisition-related contingent liabilities . the number of employees in general and administrative functions increased from 148 as of january 1 , 2020 to 163 as of december 31 , 2020. excluding intellectual property litigation and acquisition-related expense , we expect general and administrative costs to increase prospectively as our business grows . this includes cost increases related to accounting , finance , and legal personnel , additional external legal , audit fees and other expenses associated with regulations governing public companies . while somewhat unpredictable , we also expect to continue to incur costs related to litigation involving intellectual property . see the section of this annual report titled `` legal proceedings `` for additional information regarding litigation matters . research and development expense . research and development expense consists primarily of personnel and related expenses for our employees working on our product development and software and device engineering teams , including salaries , bonuses , stock-based compensation , benefits and other personnel costs . also included are non-personnel costs such as consulting and professional fees paid to third-party development resources as well as acquisition costs of ipr & d with no alternative future use . the number of employees in research and development functions grew from 621 as of january 1 , 2020 to 780 as of december 31 , 2020. our research and development efforts are focused on innovating new features and enhancing the functionality of our platforms and the solutions we offer to our service provider partners and subscribers . we will also continue to invest in efforts to extend our platforms to adjacent markets and internationally to maintain our leadership position in the development of intelligently connected property technology , and continued enhancement of our enterprise tools platform for our service provider partners . amortization and depreciation . amortization and depreciation consists of amortization of intangible assets originating from our acquisitions as well as our internally-developed capitalized software . our depreciation expense is related to investments in property and equipment . acquired intangible assets include developed technology , customer related intangibles , trademarks and trade names . we expect in the near term that amortization and depreciation may fluctuate based on our acquisition activity , development of our platforms and capitalized expenditures . interest expense interest expense consists of interest expense associated with our credit facility . on october 6 , 2017 , we entered into a $ 125.0 million senior secured revolving credit facility , or the 2017 facility ,

debt obligations on october 6 , 2017 , we entered into a $ 125.0 million senior secured revolving credit facility , or the 2017 facility , with svb , as administrative agent , pnc bank , national association , as documentation agent , and a syndicate of lenders . upon entry into the 2017 facility , we borrowed $ 72.0 million , which was used to repay the previously outstanding balance under our previous credit facility . the 2017 facility was set to mature in october 2022 and included an option to further increase the borrowing capacity to $ 175.0 million with the consent of the lenders . costs incurred in connection with the 2017 facility were capitalized and were being amortized as interest expense over the term of the 2017 facility . the 2017 facility was secured by substantially all of our assets , including our intellectual property . on march 25 , 2020 , we borrowed $ 50.0 million under the 2017 facility as a precautionary measure in order to provide financial flexibility in light of current uncertainty in the financial markets resulting from the covid-19 pandemic . during the years ended december 31 , 2020 and 2019 , we repaid $ 3.0 million and $ 4.0 million of the outstanding balance of the 2017 facility , respectively . see convertible senior notes below in this section of this annual report for further details on the repayment of all outstanding borrowings under , and the termination of , the 2017 facility subsequent to december 31 , 2020. the outstanding principal balance on the 2017 facility accrued interest at a rate equal to , at our option , either ( 1 ) libor , plus an applicable margin based on our consolidated leverage ratio , or ( 2 ) the highest of ( a ) the wall street journal prime rate , ( b ) the federal funds rate plus 0.50 % , or ( c ) libor plus 1.00 % plus an applicable margin based on our consolidated leverage ratio .


 Write a concise suspicious activity report of the following text delimited by triple backquotes. Return your response as a formal report which covers the key points highlighting the location,dates,entity names and account holder information in chronological order of the text.
     ```debt obligations on october 6 , 2017 , we entered into a $ 125.0 million senior secured revolving credit facility , or the 2017 facility , with svb , as administrative agent , pnc bank , national association , as documentation agent , and a syndicate of lenders . upon entry into the 2017 facility , we borrowed $ 72.0 million , which was used to repay the previously outstanding balance under our previous credit facility . the 2017 facility was set to mature in october 2022 and included an option to further increase the borrowing capacity to $ 175.0 million with the consent of the lenders . costs incurred in connection with the 2017 facility were capitalized and were being amortized as interest expense over the term of the 2017 facility . the 2017 facility was secured by substantially all of our assets , including our intellectual property . on march 25 , 2020 , we borrowed $ 50.0 million under the 2017 facility as a precautionary measure in order to provide financial flexibility in light of current uncertainty in the financial markets resulting from the covid-19 pandemic . during the years ended december 31 , 2020 and 2019 , we repaid $ 3.0 million and $ 4.0 million of the outstanding balance of the 2017 facility , respectively . see convertible senior notes below in this section of this annual report for further details on the repayment of all outstanding borrowings under , and the termination of , the 2017 facility subsequent to december 31 , 2020. the outstanding principal balance on the 2017 facility accrued interest at a rate equal to , at our option , either ( 1 ) libor , plus an applicable margin based on our consolidated leverage ratio , or ( 2 ) the highest of ( a ) the wall street journal prime rate , ( b ) the federal funds rate plus 0.50 % , or ( c ) libor plus 1.00 % plus an applicable margin based on our consolidated leverage ratio .
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 Suspicious Activity Report : software license revenue represented 6 % , 9 % and 10 % of our revenue in 2020 , 2019 and 2018 , respectively . we also generate revenue from the sale of many types of hardware , including video cameras , video recorders , cellular radio modules , thermostats , image sensors , gunshot detection sensors and other peripherals , that enable our solutions . our hardware and other revenue also includes our revenue from the sale of perpetual licenses that provide our customers in the commercial market the right to use our video surveillance software for an indefinite period of time in exchange for a one-time license fee . our hardware and other revenue also includes our revenue from the sale of licenses that provide our customers the right to use our gunshot detection solution in exchange for license fees . hardware and other revenue represented 36 % , 33 % and 31 % of our revenue in 2020 , 2019 and 2018 , respectively . we typically expect hardware and other revenue to fluctuate as a percentage of total revenue . highlights of our financial performance for the periods covered in this annual report include : saas and license revenue increased 17 % to $ 393.3 million in 2020 from $ 337.4 million in 2019. saas and license revenue increased 16 % to $ 337.4 million in 2019 from $ 291.1 million in 2018. total revenue increased 23 % to $ 618.0 million in 2020 from $ 502.4 million in 2019. total revenue increased 19 % to $ 502.4 million in 2019 from $ 420.5 million in 2018. net income increased 44 % to $ 76.7 million in 2020 from $ 53.3 million in 2019. net income increased 148 % to $ 53.3 million in 2019 from $ 21.5 million in 2018. net income attributable to common stockholders increased 45 % to $ 77.9 million in 2020 from $ 53.5 million in 2019. net income attributable to common stockholders increased 149 % to $ 53.5 million in 2019 from $ 21.5 million in 2018. adjusted ebitda , a non-gaap measurement of operating performance , increased to $ 125.3 million in 2020 from $ 108.3 million in 2019. adjusted ebitda increased to $ 108.3 million in 2019 from $ 93.1 million in 2018. please see non-gaap measures below in this section of this annual report for a discussion of the limitations of adjusted ebitda ( a non-gaap measure ) and a reconciliation of adjusted ebitda to net income , the most comparable gaap measure , for the years ended december 31 , 2020 , 2019 and 2018. historical trends within the financial results information about current period and prior period acquisitions that may affect the comparability of our historical financial information is included in item 1. business . in 2018 , we recorded an expense of $ 28.0 million in general and administrative expense , which relates to the agreement reached to settle the legal matter alleging violations of the telephone consumer protection act , or tcpa , which may affect the comparability of our historical financial information . information about the $ 1.7 million of interest recorded within interest income and the $ 6.9 million of gain recorded within other income , net , in 2019 , which relates to promissory note proceeds received from one of our hardware suppliers and proceeds from an acquired promissory note , and may affect the comparability of our historical financial information , is disclosed in the comparison of years ended december 31 , 2020 to december 31 , 2019 section below within item 7 . `` management 's discussion and analysis of financial condition and results of operations . `` information about the $ 24.7 million gain on the sale of an investment recorded in other income , net , in 2020 , which relates to the sale of an investment in one of our platform partners , and may affect the comparability of historical financial information , is disclosed in the comparison of years ended december 31 , 2020 to december 31 , 2019 section below within item 7 . `` management 's discussion and analysis of financial condition and results of operations . 52 geographic areas we believe there is significant opportunity to expand our international business , as 3 % of our total revenue during the year ended december 31 , 2020 originated from customers located outside of north america . our products are currently localized and available in over 40 countries outside of north america . recent developments the covid-19 pandemic disrupted and may continue to disrupt our supply chain for an unknown period of time due to its impact on manufacturing , production and global transportation . the covid-19 pandemic also disrupted and may intermittently continue to disrupt our sales channels due to restrictions on our service providers ' ability to meet with residential and commercial property owners who use our solutions . we have taken precautionary measures intended to help protect our employees , service providers and subscribers , as well as the communities in which we participate , including enabling substantially all of our employees to work remotely . in addition , the covid-19 pandemic resulted in a global slowdown of economic activity and a recession in the united states and the economic situation remains fluid as parts of the economy appear to be recovering while others continue to struggle . while vaccines have been approved for use in the united states and in many other countries , supplies of the vaccine remain limited and it remains difficult to assess or predict the ultimate duration and economic impact of the covid-19 pandemic . prolonged uncertainty with respect to covid-19 could cause further economic slowdown or cause other unpredictable events , each of which could adversely affect our business , results of operations or financial condition . story_separator_special_tag tariffs have subjected certain alarm.com products manufactured overseas to additional import duties of up to 25 % . the amount of the import tariff and the number of products subject to tariffs have changed numerous times based on action by the u.s. administration . approximately one-fifth to one-half of the finished goods hardware products that we sell to our service provider partners are imported from china and could be subject to increased tariffs . while the additional import duties resulted in an increase to our cost of hardware revenue , these import duties had a modest impact on hardware revenue margins . we continue to monitor the changes in tariffs . if tariffs are increased or are expanded to apply to more of our products , such actions may increase our cost of hardware revenue and reduce our hardware revenue margins in the future . 56 operating expenses our operating expenses consist of sales and marketing , general and administrative , research and development and amortization and depreciation expenses . salaries , bonuses , stock-based compensation , benefits and other personnel related costs are the most significant components of each of these expense categories , excluding amortization and depreciation . we include stock-based compensation expense in connection with the grant of stock options and other forms of equity compensation in the applicable operating expense category based on the respective equity award recipient 's function ( sales and marketing , general and administrative or research and development ) . we grew from 1,160 employees as of january 1 , 2020 to 1,404 employees as of december 31 , 2020 , and we expect to continue to hire new employees to support the projected future growth of our business . sales and marketing expense . sales and marketing expense consists primarily of personnel and related expenses for our sales and marketing teams , including salaries , bonuses , stock-based compensation , benefits , travel , and commissions . our sales and marketing teams engage in sales , account management , service provider partner support , advertising , promotion of our products and services and marketing . the number of employees in sales and marketing functions increased from 391 as of january 1 , 2020 to 461 as of december 31 , 2020. we expect to continue to invest in our sales and marketing activities to expand our business both domestically and internationally . we intend to increase the size of our sales force and our service provider partner support team to provide additional support to our existing service provider partner base to drive their productivity in selling our solutions as well as to enroll new service provider partners in north america and in international markets . general and administrative expense . general and administrative expense consists primarily of personnel and related expenses for our administrative , legal , human resources , finance and accounting personnel , including salaries , bonuses , stock-based compensation , benefits and other personnel costs . additional expenses included in this category are legal costs , including those that are incurred to defend and license our intellectual property , as well as non-personnel costs , such as travel related expenses , rent , subcontracting and professional fees , audit fees , tax services , and insurance expenses . also included in general and administrative expenses are credit losses and acquisition-related expenses , which consist primarily of legal , accounting and professional service fees directly related to acquisitions and valuation gains or losses on acquisition-related contingent liabilities . the number of employees in general and administrative functions increased from 148 as of january 1 , 2020 to 163 as of december 31 , 2020. excluding intellectual property litigation and acquisition-related expense , we expect general and administrative costs to increase prospectively as our business grows . this includes cost increases related to accounting , finance , and legal personnel , additional external legal , audit fees and other expenses associated with regulations governing public companies . while somewhat unpredictable , we also expect to continue to incur costs related to litigation involving intellectual property . see the section of this annual report titled `` legal proceedings `` for additional information regarding litigation matters . research and development expense . research and development expense consists primarily of personnel and related expenses for our employees working on our product development and software and device engineering teams , including salaries , bonuses , stock-based compensation , benefits and other personnel costs . also included are non-personnel costs such as consulting and professional fees paid to third-party development resources as well as acquisition costs of ipr & d with no alternative future use . the number of employees in research and development functions grew from 621 as of january 1 , 2020 to 780 as of december 31 , 2020. our research and development efforts are focused on innovating new features and enhancing the functionality of our platforms and the solutions we offer to our service provider partners and subscribers . we will also continue to invest in efforts to extend our platforms to adjacent markets and internationally to maintain our leadership position in the development of intelligently connected property technology , and continued enhancement of our enterprise tools platform for our service provider partners . amortization and depreciation . amortization and depreciation consists of amortization of intangible assets originating from our acquisitions as well as our internally-developed capitalized software . our depreciation expense is related to investments in property and equipment . acquired intangible assets include developed technology , customer related intangibles , trademarks and trade names . we expect in the near term that amortization and depreciation may fluctuate based on our acquisition activity , development of our platforms and capitalized expenditures . interest expense interest expense consists of interest expense associated with our credit facility . on october 6 , 2017 , we entered into a $ 125.0 million senior secured revolving credit facility , or the 2017 facility ,

