specifically , economic challenges that enterprise customers in certain verticals have experienced , as well as weakness in our commercial segment that targets small- and medium-sized businesses , have adversely impacted the length of the sales cycle and the expansion and new business sales with these customers , which has further resulted in a continued reduction in our dollar-based net expansion rate . see key business metrics and results of operations for further discussion . despite these changes , we experienced an increase in revenue for the twelve months ended december 31 , 2020 as compared to the twelve months ended december 31 , 2019. however , as a result of the impact of the covid-19 pandemic on our operating results for the twelve months ended december 31 , 2020 , we performed at levels lower than planned prior to the covid-19 pandemic . to support the health and well-being of our employees , customers , partners and communities , the majority of our offices worldwide remain temporarily closed and nearly all of our employees continue to work remotely . our offices will not re-open until local authorities permit us to do so and our own criteria and conditions to ensure employee health and safety are satisfied , including social distancing and enhanced cleaning protocols . while we have developed plans for our employees to begin safely returning to their respective offices , we can not predict when or how we will begin to lift the work from home requirements for geographic areas that continue to be significantly impacted by the pandemic or certain other actions taken as part of our business continuity plans , including travel restrictions . while the adjustments to our operations may result in inefficiencies , delays and additional costs in our product development , sales , marketing , and customer support efforts , as of the date of this filing , we do not believe our work from home protocol has materially adversely impacted our internal controls , financial reporting systems or our operations . in october 2019 , we entered into a new operating lease agreement for space located in irvine , california that will eventually replace our existing corporate headquarters . although the impact of the pandemic on the commercial real estate market is still evolving , the continued restrictions imposed by local authorities over the use of office space could impair our ability to find viable subtenants for our existing corporate headquarters , which could result in additional costs when we cease use of that space . in response to the ongoing covid-19 pandemic , we have implemented plans to manage our costs . in 2020 , we temporarily limited the addition of new employees and third-party contracted services , curtailed most travel expense except where critical to the business , and acted to limit discretionary spending . we intend to resume these activities in 2021 to the extent possible based on our policies and public health guidance , but to the extent the business disruption continues for an extended period , additional cost management actions may be considered . although we continue to monitor the situation and may adjust our current policies as more information and public health guidance become available , the ongoing effects of the covid-19 pandemic and or the precautionary measures that we , our customers and governmental authorities have adopted have resulted in , and could continue to result in , customers not purchasing or renewing our products or services , significant delays or lengthening of our sales cycles , and reductions in average transaction sizes , and could negatively affect our customer success and sales and marketing efforts , result in difficulties or changes to our customer support , or create operational or other challenges , any of which could harm our business and operating results . because our products are offered as subscription-based licenses and a portion of that revenue is recognized over time , the effect of the pandemic may not be fully reflected in our operating results until future periods . further , the covid-19 pandemic and its impact on us and the economy has significantly limited our ability to forecast our future operating results , including our ability to predict revenue and expense levels , and plan for and model future operating results . our competitors could experience similar or different impacts as a result of the covid-19 pandemic , which could result in changes to our competitive landscape . while we have developed and continue to develop plans to help mitigate the negative impact of the pandemic on our business , these efforts may not be effective and any protracted economic downturn could significantly affect our business and operating results . we will continue to evaluate the nature and extent of the impact of the covid-19 pandemic to our business . see part i , item 1a . risk factors of this annual report for further discussion of the possible impact of the covid-19 pandemic on our business . 57 key factors affecting our performance we believe that our current and future performance are dependent on many factors , including , but not limited to , those described below . while these areas present significant opportunity , they also present risks that we must manage to achieve successful results . for more information about these risks , see the section titled “ risk factors ” included elsewhere in this annual report . if we are unable to address these risks , our business and operating results could be adversely affected . expansion and further penetration of our customer base . we employ a “ land and expand ” business model that focuses on efficiently acquiring new customers and growing our relationships with existing customers over time . story_separator_special_tag provision for ( benefit of ) income taxes provision for ( benefit of ) income taxes consists primarily of accrued current and deferred income taxes imposed by the united states and foreign jurisdictions in which we conduct business . results of operations for the years ended december 31 , 2020 , 2019 and 2018 replace_table_token_6_th 62 ( 1 ) amounts include stock-based compensation expense as follows : replace_table_token_7_th a discussion regarding our financial condition and results of operations for the year ended december 31 , 2019 compared to the year ended december 31 , 2018 is included in part ii , item 7 , “ management 's discussion and analysis of financial condition and results of operations—results of operation , ” included in our annual report on form 10-k for the year ended december 31 , 2019 , filed with the sec on february 14 , 2020. revenue replace_table_token_8_th the increase in subscription-based software license revenue for the year ended december 31 , 2020 as compared to the year ended december 31 , 2019 was primarily due to additional sales to new and existing customers , as well as the impact of product mix . the average term length of sales to our customers remained relatively flat at approximately two years for both 2020 and 2019. pcs and services revenue is primarily recognized ratably over the subscription term . due to the ratable recognition of this revenue over time , the increases in pcs and service revenue is primarily attributed to sales to customers in prior periods and the growth in our customer base between december 31 , 2019 and december 31 , 2020. our product pricing was not a significant driver of the increase in subscription-based software license or pcs and services revenue for the periods presented . the disaggregation of revenue by region was as follows ( in thousands ) : replace_table_token_9_th 63 cost of revenue and gross margin replace_table_token_10_th cost of revenue increased for the year ended december 31 , 2020 as compared to the year ended december 31 , 2019 primarily due to an increase in employee-related costs , including stock-based compensation expense of $ 1.5 million due to the timing of when employees were hired in 2019 and 2020. the increase was also attributable to an increase in consulting and outsourced labor costs of $ 0.3 million , an increase in it and overhead costs of $ 0.3 million to support the additional headcount and an increase of $ 2.0 million due to a non-cash impairment charge related to certain developed technology assets as a result of our strategic decision to discontinue further investment and enhancements in the standalone existing technology . as of december 31 , 2020 , we had 101 cost of revenue personnel compared to 102 as of december 31 , 2019. the increase in gross margin for the year ended december 31 , 2020 as compared to the year ended december 31 , 2019 was the result of an increase in revenue from pcs and services as described above , attributable mainly to sales to customers in prior periods , as the majority of our cost of revenue does not fluctuate directly with increases in revenue . our customers continue to utilize alteryx community for self-service support , which relies on engagement with other end-users and our partners , resulting in lower support costs as a percentage of revenue . research and development replace_table_token_11_th research and development expense increased for the year ended december 31 , 2020 as compared to the year ended december 31 , 2019 primarily due to an increase in employee-related costs , including stock-based compensation expense , of $ 24.9 million resulting from an increase in headcount and the timing of when employees were hired , partly attributable to the clearstory data and feature labs acquisitions in 2019. in addition , there was an increase of $ 1.0 million in consulting and professional fees due to the utilization of contractors for certain development projects and an increase of $ 5.1 million in overhead costs to support the additional headcount . as of december 31 , 2020 , we had 366 research and development personnel compared to 302 as of december 31 , 2019. sales and marketing replace_table_token_12_th 64 sales and marketing expense increased for the year ended december 31 , 2020 as compared to the year ended december 31 , 2019 primarily due to an increase in employee-related costs , including stock-based compensation , of $ 49.9 million due to an increase in headcount and the timing when employees were hired , with such amount including the effect of a decrease in travel and entertainment expense of $ 6.3 million as a result of travel restrictions associated with the covid-19 pandemic . the increase is also attributable to an increase of $ 6.9 million in it and overhead costs to support the additional headcount and an increase of $ 3.0 million associated with consulting and outsourced labor related to fees paid to channel partners and contractors to extend the reach of our sales and marketing programs . these increases were partially offset by a decrease of $ 0.7 million in marketing programs primarily due to the cancellation of our annual user conferences and other in-person marketing events , with such decrease partially offset by an increase in our digital marketing programs . as of december 31 , 2020 , we had 746 sales and marketing personnel compared to 639 as of december 31 , 2019. general and administrative replace_table_token_13_th general and administrative expense increased for the year ended december 31 , 2020 as compared to the year ended december 31 , 2019 primarily due to an increase in employee-related costs , including stock-based compensation , of $ 20.3 million due to an increase in headcount and the timing of when employees were hired and an increase of $ 1.5 million in it and overhead costs to support the additional headcount . these increases were partially offset by

cash flows the following table sets forth cash flows for the periods indicated : replace_table_token_16_th operating activities our net income ( loss ) and cash flow from operating activities are significantly influenced by our investments in headcount and infrastructure to support anticipated growth . for the year ended december 31 , 2020 , net cash provided by operating activities was $ 74.8 million . net cash provided by operating activities primarily reflected net non-cash activity of $ 123.9 million , offset in part by net loss of $ 24.4 million and change in operating assets and liabilities of $ 24.7 million . for the year ended december 31 , 2019 , net cash provided by operating activities was $ 34.2 million . net cash provided by operating activities primarily reflected net income of $ 27.1 million and net non-cash activity of $ 58.4 million , offset in part by a change in operating assets and liabilities of $ 51.4 million . the increase in non-cash activity was primarily driven by $ 31.7 million of amortization of debt discount and issuance costs , stock-based compensation expense of $ 74.9 million due to higher headcount and additional stock-based awards , partially offset by deferred income taxes of $ 4.9 million primarily associated with excess tax deductions from exercised stock options and settled rsus .


 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.
     ```cash flows the following table sets forth cash flows for the periods indicated : replace_table_token_16_th operating activities our net income ( loss ) and cash flow from operating activities are significantly influenced by our investments in headcount and infrastructure to support anticipated growth . for the year ended december 31 , 2020 , net cash provided by operating activities was $ 74.8 million . net cash provided by operating activities primarily reflected net non-cash activity of $ 123.9 million , offset in part by net loss of $ 24.4 million and change in operating assets and liabilities of $ 24.7 million . for the year ended december 31 , 2019 , net cash provided by operating activities was $ 34.2 million . net cash provided by operating activities primarily reflected net income of $ 27.1 million and net non-cash activity of $ 58.4 million , offset in part by a change in operating assets and liabilities of $ 51.4 million . the increase in non-cash activity was primarily driven by $ 31.7 million of amortization of debt discount and issuance costs , stock-based compensation expense of $ 74.9 million due to higher headcount and additional stock-based awards , partially offset by deferred income taxes of $ 4.9 million primarily associated with excess tax deductions from exercised stock options and settled rsus .
```    
 Suspicious Activity Report : specifically , economic challenges that enterprise customers in certain verticals have experienced , as well as weakness in our commercial segment that targets small- and medium-sized businesses , have adversely impacted the length of the sales cycle and the expansion and new business sales with these customers , which has further resulted in a continued reduction in our dollar-based net expansion rate . see key business metrics and results of operations for further discussion . despite these changes , we experienced an increase in revenue for the twelve months ended december 31 , 2020 as compared to the twelve months ended december 31 , 2019. however , as a result of the impact of the covid-19 pandemic on our operating results for the twelve months ended december 31 , 2020 , we performed at levels lower than planned prior to the covid-19 pandemic . to support the health and well-being of our employees , customers , partners and communities , the majority of our offices worldwide remain temporarily closed and nearly all of our employees continue to work remotely . our offices will not re-open until local authorities permit us to do so and our own criteria and conditions to ensure employee health and safety are satisfied , including social distancing and enhanced cleaning protocols . while we have developed plans for our employees to begin safely returning to their respective offices , we can not predict when or how we will begin to lift the work from home requirements for geographic areas that continue to be significantly impacted by the pandemic or certain other actions taken as part of our business continuity plans , including travel restrictions . while the adjustments to our operations may result in inefficiencies , delays and additional costs in our product development , sales , marketing , and customer support efforts , as of the date of this filing , we do not believe our work from home protocol has materially adversely impacted our internal controls , financial reporting systems or our operations . in october 2019 , we entered into a new operating lease agreement for space located in irvine , california that will eventually replace our existing corporate headquarters . although the impact of the pandemic on the commercial real estate market is still evolving , the continued restrictions imposed by local authorities over the use of office space could impair our ability to find viable subtenants for our existing corporate headquarters , which could result in additional costs when we cease use of that space . in response to the ongoing covid-19 pandemic , we have implemented plans to manage our costs . in 2020 , we temporarily limited the addition of new employees and third-party contracted services , curtailed most travel expense except where critical to the business , and acted to limit discretionary spending . we intend to resume these activities in 2021 to the extent possible based on our policies and public health guidance , but to the extent the business disruption continues for an extended period , additional cost management actions may be considered . although we continue to monitor the situation and may adjust our current policies as more information and public health guidance become available , the ongoing effects of the covid-19 pandemic and or the precautionary measures that we , our customers and governmental authorities have adopted have resulted in , and could continue to result in , customers not purchasing or renewing our products or services , significant delays or lengthening of our sales cycles , and reductions in average transaction sizes , and could negatively affect our customer success and sales and marketing efforts , result in difficulties or changes to our customer support , or create operational or other challenges , any of which could harm our business and operating results . because our products are offered as subscription-based licenses and a portion of that revenue is recognized over time , the effect of the pandemic may not be fully reflected in our operating results until future periods . further , the covid-19 pandemic and its impact on us and the economy has significantly limited our ability to forecast our future operating results , including our ability to predict revenue and expense levels , and plan for and model future operating results . our competitors could experience similar or different impacts as a result of the covid-19 pandemic , which could result in changes to our competitive landscape . while we have developed and continue to develop plans to help mitigate the negative impact of the pandemic on our business , these efforts may not be effective and any protracted economic downturn could significantly affect our business and operating results . we will continue to evaluate the nature and extent of the impact of the covid-19 pandemic to our business . see part i , item 1a . risk factors of this annual report for further discussion of the possible impact of the covid-19 pandemic on our business . 57 key factors affecting our performance we believe that our current and future performance are dependent on many factors , including , but not limited to , those described below . while these areas present significant opportunity , they also present risks that we must manage to achieve successful results . for more information about these risks , see the section titled “ risk factors ” included elsewhere in this annual report . if we are unable to address these risks , our business and operating results could be adversely affected . expansion and further penetration of our customer base . we employ a “ land and expand ” business model that focuses on efficiently acquiring new customers and growing our relationships with existing customers over time . story_separator_special_tag provision for ( benefit of ) income taxes provision for ( benefit of ) income taxes consists primarily of accrued current and deferred income taxes imposed by the united states and foreign jurisdictions in which we conduct business . results of operations for the years ended december 31 , 2020 , 2019 and 2018 replace_table_token_6_th 62 ( 1 ) amounts include stock-based compensation expense as follows : replace_table_token_7_th a discussion regarding our financial condition and results of operations for the year ended december 31 , 2019 compared to the year ended december 31 , 2018 is included in part ii , item 7 , “ management 's discussion and analysis of financial condition and results of operations—results of operation , ” included in our annual report on form 10-k for the year ended december 31 , 2019 , filed with the sec on february 14 , 2020. revenue replace_table_token_8_th the increase in subscription-based software license revenue for the year ended december 31 , 2020 as compared to the year ended december 31 , 2019 was primarily due to additional sales to new and existing customers , as well as the impact of product mix . the average term length of sales to our customers remained relatively flat at approximately two years for both 2020 and 2019. pcs and services revenue is primarily recognized ratably over the subscription term . due to the ratable recognition of this revenue over time , the increases in pcs and service revenue is primarily attributed to sales to customers in prior periods and the growth in our customer base between december 31 , 2019 and december 31 , 2020. our product pricing was not a significant driver of the increase in subscription-based software license or pcs and services revenue for the periods presented . the disaggregation of revenue by region was as follows ( in thousands ) : replace_table_token_9_th 63 cost of revenue and gross margin replace_table_token_10_th cost of revenue increased for the year ended december 31 , 2020 as compared to the year ended december 31 , 2019 primarily due to an increase in employee-related costs , including stock-based compensation expense of $ 1.5 million due to the timing of when employees were hired in 2019 and 2020. the increase was also attributable to an increase in consulting and outsourced labor costs of $ 0.3 million , an increase in it and overhead costs of $ 0.3 million to support the additional headcount and an increase of $ 2.0 million due to a non-cash impairment charge related to certain developed technology assets as a result of our strategic decision to discontinue further investment and enhancements in the standalone existing technology . as of december 31 , 2020 , we had 101 cost of revenue personnel compared to 102 as of december 31 , 2019. the increase in gross margin for the year ended december 31 , 2020 as compared to the year ended december 31 , 2019 was the result of an increase in revenue from pcs and services as described above , attributable mainly to sales to customers in prior periods , as the majority of our cost of revenue does not fluctuate directly with increases in revenue . our customers continue to utilize alteryx community for self-service support , which relies on engagement with other end-users and our partners , resulting in lower support costs as a percentage of revenue . research and development replace_table_token_11_th research and development expense increased for the year ended december 31 , 2020 as compared to the year ended december 31 , 2019 primarily due to an increase in employee-related costs , including stock-based compensation expense , of $ 24.9 million resulting from an increase in headcount and the timing of when employees were hired , partly attributable to the clearstory data and feature labs acquisitions in 2019. in addition , there was an increase of $ 1.0 million in consulting and professional fees due to the utilization of contractors for certain development projects and an increase of $ 5.1 million in overhead costs to support the additional headcount . as of december 31 , 2020 , we had 366 research and development personnel compared to 302 as of december 31 , 2019. sales and marketing replace_table_token_12_th 64 sales and marketing expense increased for the year ended december 31 , 2020 as compared to the year ended december 31 , 2019 primarily due to an increase in employee-related costs , including stock-based compensation , of $ 49.9 million due to an increase in headcount and the timing when employees were hired , with such amount including the effect of a decrease in travel and entertainment expense of $ 6.3 million as a result of travel restrictions associated with the covid-19 pandemic . the increase is also attributable to an increase of $ 6.9 million in it and overhead costs to support the additional headcount and an increase of $ 3.0 million associated with consulting and outsourced labor related to fees paid to channel partners and contractors to extend the reach of our sales and marketing programs . these increases were partially offset by a decrease of $ 0.7 million in marketing programs primarily due to the cancellation of our annual user conferences and other in-person marketing events , with such decrease partially offset by an increase in our digital marketing programs . as of december 31 , 2020 , we had 746 sales and marketing personnel compared to 639 as of december 31 , 2019. general and administrative replace_table_token_13_th general and administrative expense increased for the year ended december 31 , 2020 as compared to the year ended december 31 , 2019 primarily due to an increase in employee-related costs , including stock-based compensation , of $ 20.3 million due to an increase in headcount and the timing of when employees were hired and an increase of $ 1.5 million in it and overhead costs to support the additional headcount . these increases were partially offset by

