trading partner analytics . our trading partner analytics solution consists of data analytics applications which allow our customers to improve their visibility across , and analysis of , their supply chains . through interactive data analysis , our retailer customers improve their visibility into supplier performance and their understanding of product sell-through . our revenues for this solution primarily consist of a monthly subscription fee . other trading partner solutions . the remainder of our revenues are derived from solutions that allow our customers to perform tasks such as barcode labeling or picking-and-packaging information tracking as well as purchases of miscellaneous supplies . these revenues are primarily transaction-based . 34 cost of revenues and operating expenses cost of revenues . cost of revenues consist primarily of personnel costs for our customer success and implementation teams , customer support personnel and application support personnel . cost of revenues also includes our cost of network services , which is primarily data center costs for the locations where we keep the equipment that serves our customers , and connectivity costs that facilitate electronic data transmission between our customers and their trading partners . sales and marketing expenses . sales and marketing expenses consist primarily of personnel costs for our sales , marketing and product management teams , commissions earned by our sales personnel and marketing costs . in order to expand our business , we will continue to add resources to our sales and marketing efforts over time . research and development expenses . research and development expenses consist primarily of personnel costs for development of new and maintenance of existing solutions . our research and development group is also responsible for enhancing existing solutions and applications as well as internal tools and developing new information maps that integrate our customers to their trading partners in compliance with those trading partners ' requirements . general and administrative expenses . general and administrative expenses consist primarily of personnel costs for finance , human resources and internal information technology support , as well as legal , accounting and other fees , such as credit card processing fees . overhead allocation . we allocate overhead expenses such as rent , certain employee benefit costs , office supplies and depreciation of general office assets to cost of revenues and operating expenses categories based on headcount . other metrics recurring revenue customers . as of december 31 , 2015 , we had approximately 23,000 customers with contracts to pay us monthly fees , which we refer to as recurring revenue customers . we report recurring revenue customers at the end of a period . a small portion of our recurring revenue customers consist of separate units within a larger organization . we treat each of these units , which may include divisions , departments , affiliates and franchises , as distinct customers . average recurring revenues per recurring revenue customer . we calculate average recurring revenues per recurring revenue customer , which we also refer to as wallet share , by dividing the recurring revenues from recurring revenue customers for the period by the average of the beginning and ending number of recurring revenue customers for the period . for interim periods , we annualize this number by multiplying the quotient calculated above by the quotient of 12 divided by the number of months in the period . we anticipate that average recurring revenues per recurring revenue customer will continue to increase as we increase the number of solutions we offer and increase the penetration of those solutions across our customer base . non-gaap financial measures . to supplement our financial statements , we also provide investors with adjusted ebitda and non-gaap income per share , both of which are non-gaap financial measures . we believe that these non-gaap measures provide useful information to management and investors regarding certain financial and business trends relating to our financial condition and results of operations . our management uses these non-gaap measures to compare the company 's performance to that of prior periods for trend analyses and planning purposes . adjusted ebitda is also used for purposes of determining executive and senior management incentive compensation . these measures are also presented to our board of directors . these non-gaap measures should not be considered a substitute for , or superior to , financial measures calculated in accordance with generally accepted accounting principles in the united states of america . these 35 non-gaap financial measures exclude significant expenses and income that are required by gaap to be recorded in the company 's financial statements and are subject to inherent limitations . investors should review the reconciliations of non-gaap financial measures to the comparable gaap financial measures that are included in this management 's discussion and analysis of financial condition and results of operations. critical accounting policies and estimates the discussion of our financial condition and results of operations is based upon our financial statements , which are prepared in accordance with accounting principles generally accepted in the united states of america , or gaap . the preparation of these financial statements requires us to make estimates , judgments and assumptions that affect the reported amounts of assets , liabilities , revenues , costs and expenses and related disclosures . on an ongoing basis , we evaluate our estimates and assumptions . we base our estimates of the carrying value of certain assets and liabilities on historical experience and on various other assumptions that we believe to be reasonable . our actual results may differ from these estimates under different assumptions or conditions . we believe that of our significant accounting policies , which are described in the notes to our financial statements , the following accounting policies involve a greater degree of judgment , complexity and effect on materiality . story_separator_special_tag 41 sales and marketing expenses . sales and marketing expenses for 2014 increased $ 7.4 million , or 19 % , to $ 47.0 million from $ 39.6 million for 2013. this increase was primarily due to increased headcount in 2014 , which resulted in higher personnel-related costs of $ 3.3 million , commissions earned by sales personnel from new business of $ 2.3 million , occupancy costs of $ 569,000 and stock based compensation expense of $ 452,000. we also had increased promotional costs of $ 305,000 and depreciation expense of $ 299,000 in 2014 as compared to 2013. as a percentage of revenues , sales and marketing expenses were 37 % for 2014 compared to 38 % for 2013. as we expand our business , we will continue to add resources to our sales and marketing efforts over time , and we expect that these expenses will continue to increase in absolute dollars . research and development expenses . research and development expenses for 2014 increased $ 2.6 million , or 24 % , to $ 13.5 million from $ 10.9 million for 2013. this increase was primarily due to increased headcount in 2014 which resulted in higher personnel-related costs of $ 2.0 million , occupancy costs of $ 226,000 and stock based compensation expense of $ 173,000. we also incurred higher expenses for software and cloud based subscriptions of approximately $ 180,000 in 2014 as compared to 2013. as a percentage of revenues , research and development expenses were 11 % for 2014 , compared to 10 % for 2013. as we enhance and expand our solutions and applications , we expect that research and development expenses will continue to increase in absolute dollars . general and administrative expenses . general and administrative expenses for 2014 increased $ 3.0 million , or 18 % , to $ 20.2 million from $ 17.2 million for 2013. this increase was primarily due to increased headcount in 2014 which resulted in higher personnel-related costs of $ 707,000 , occupancy costs of $ 188,000 and stock based compensation expense of $ 423,000. the increase was also due to increased legal costs , including costs related to the leadtec acquisition of $ 692,000 and computer software and hardware maintenance of $ 358,000 in 2014 as compared to 2013. as a percentage of revenues , general and administrative expenses were 16 % for 2014 , compared to 17 % for 2013. going forward , we expect that general and administrative expenses will continue to increase in absolute dollars as we expand our business . amortization of intangible assets . amortization of intangible assets for 2014 decreased $ 302,000 from 2013. amortization expense for 2013 included $ 290,000 for the impairment of a certain non-competition agreement . other expense . other expense for 2014 included $ 338,000 for a one-time australian stamp duty tax related to the leadtec acquisition in october 2014. income tax expense . our 2014 provision for income taxes was $ 1.4 million and included current federal , state and foreign income taxes as well as deferred federal and state income taxes . our 2013 provision for income taxes was $ 686,000 and included current state and foreign income taxes as well as deferred federal and state income taxes . it also included a one-time tax benefit for the retroactive benefit of the 2012 federal r & d credit . if this one-time tax benefit were excluded , our 2013 provision for income taxes would have been $ 803,000. see note k to our consolidated financial statements , included in this annual report on form 10-k , for additional information regarding our income taxes . 42 adjusted ebitda . adjusted ebitda , which is a non-gaap measure of financial performance , consists of net income plus depreciation and amortization , interest expense , interest income , income tax expense , stock-based compensation expense and other adjustments as necessary for a fair presentation . other adjustments included the impact of a one-time australian stamp duty tax related to the leadtec acquisition in 2014 , as well as the impact of use tax refunds in 2014 and 2013 related to items previously expensed . the following table provides a reconciliation of net income to adjusted ebitda ( in thousands ) : replace_table_token_13_th non-gaap income per share . non-gaap income per share , which is also a non-gaap measure of financial performance , consists of net income plus stock-based compensation expense and amortization expense related to intangible assets divided by the weighted average number of shares of common stock outstanding during each period . the following table provides a reconciliation of net income to non-gaap income per share ( in thousands , except per share amounts ) : replace_table_token_14_th story_separator_special_tag style= `` margin-top:12px ; margin-bottom:0px ; text-indent:4 % `` > during the last three years , inflation and changing prices have not had a material effect on our business and we do not expect that inflation or changing prices will materially affect our business in the foreseeable future . off-balance sheet arrangements we do not have any off-balance sheet arrangements , investments in special purpose entities or undisclosed borrowings or debt . additionally , we are not a party to any derivative contracts or synthetic leases . contractual and commercial commitment summary our contractual obligations and commercial commitments as of december 31 , 2015 are summarized below : replace_table_token_15_th seasonality the size and breadth of our customer base mitigates the seasonality of any particular retailer . as a result , our results of operations are not materially affected by seasonality . recent accounting pronouncements in may 2014 , the fasb issued asu no . 2014-09 , revenue from contracts with customers ( topic 606 ) , which requires an entity to recognize the amount of revenue to which it expects to be entitled for the transfer of promised goods or services to customers accounting requirements for the recognition of revenue from contracts with customers

liquidity and capital resources at december 31 , 2015 , our principal sources of liquidity were cash , cash equivalents and marketable securities totaling $ 144.0 million and accounts receivable , net of allowance for doubtful accounts of $ 17.6 million compared to cash and cash equivalents of $ 130.8 million and accounts receivable , net of allowance for doubtful accounts of $ 15.4 million at december 31 , 2014. marketable securities are invested in accordance with our investment policy , with a goal of maintaining liquidity and capital preservation . our cash equivalents and marketable securities are held in highly liquid money market funds , commercial paper , federal agency securities and corporate debt securities . 43 net cash flows from operating activities net cash provided by operating activities was $ 14.4 million for 2015 compared to $ 16.8 million for 2014. the decrease in operating cash flows as compared to 2014 was driven by the decrease in accounts payable and accrued expenses due to the timing of payments and the leadtec acquisition in the fourth quarter of 2014 along with the decrease in other current and non-current assets also due to the timing of payments , which is somewhat offset by higher net income and the increase in non-cash expenses .


 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.
     ```liquidity and capital resources at december 31 , 2015 , our principal sources of liquidity were cash , cash equivalents and marketable securities totaling $ 144.0 million and accounts receivable , net of allowance for doubtful accounts of $ 17.6 million compared to cash and cash equivalents of $ 130.8 million and accounts receivable , net of allowance for doubtful accounts of $ 15.4 million at december 31 , 2014. marketable securities are invested in accordance with our investment policy , with a goal of maintaining liquidity and capital preservation . our cash equivalents and marketable securities are held in highly liquid money market funds , commercial paper , federal agency securities and corporate debt securities . 43 net cash flows from operating activities net cash provided by operating activities was $ 14.4 million for 2015 compared to $ 16.8 million for 2014. the decrease in operating cash flows as compared to 2014 was driven by the decrease in accounts payable and accrued expenses due to the timing of payments and the leadtec acquisition in the fourth quarter of 2014 along with the decrease in other current and non-current assets also due to the timing of payments , which is somewhat offset by higher net income and the increase in non-cash expenses .
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 Suspicious Activity Report : trading partner analytics . our trading partner analytics solution consists of data analytics applications which allow our customers to improve their visibility across , and analysis of , their supply chains . through interactive data analysis , our retailer customers improve their visibility into supplier performance and their understanding of product sell-through . our revenues for this solution primarily consist of a monthly subscription fee . other trading partner solutions . the remainder of our revenues are derived from solutions that allow our customers to perform tasks such as barcode labeling or picking-and-packaging information tracking as well as purchases of miscellaneous supplies . these revenues are primarily transaction-based . 34 cost of revenues and operating expenses cost of revenues . cost of revenues consist primarily of personnel costs for our customer success and implementation teams , customer support personnel and application support personnel . cost of revenues also includes our cost of network services , which is primarily data center costs for the locations where we keep the equipment that serves our customers , and connectivity costs that facilitate electronic data transmission between our customers and their trading partners . sales and marketing expenses . sales and marketing expenses consist primarily of personnel costs for our sales , marketing and product management teams , commissions earned by our sales personnel and marketing costs . in order to expand our business , we will continue to add resources to our sales and marketing efforts over time . research and development expenses . research and development expenses consist primarily of personnel costs for development of new and maintenance of existing solutions . our research and development group is also responsible for enhancing existing solutions and applications as well as internal tools and developing new information maps that integrate our customers to their trading partners in compliance with those trading partners ' requirements . general and administrative expenses . general and administrative expenses consist primarily of personnel costs for finance , human resources and internal information technology support , as well as legal , accounting and other fees , such as credit card processing fees . overhead allocation . we allocate overhead expenses such as rent , certain employee benefit costs , office supplies and depreciation of general office assets to cost of revenues and operating expenses categories based on headcount . other metrics recurring revenue customers . as of december 31 , 2015 , we had approximately 23,000 customers with contracts to pay us monthly fees , which we refer to as recurring revenue customers . we report recurring revenue customers at the end of a period . a small portion of our recurring revenue customers consist of separate units within a larger organization . we treat each of these units , which may include divisions , departments , affiliates and franchises , as distinct customers . average recurring revenues per recurring revenue customer . we calculate average recurring revenues per recurring revenue customer , which we also refer to as wallet share , by dividing the recurring revenues from recurring revenue customers for the period by the average of the beginning and ending number of recurring revenue customers for the period . for interim periods , we annualize this number by multiplying the quotient calculated above by the quotient of 12 divided by the number of months in the period . we anticipate that average recurring revenues per recurring revenue customer will continue to increase as we increase the number of solutions we offer and increase the penetration of those solutions across our customer base . non-gaap financial measures . to supplement our financial statements , we also provide investors with adjusted ebitda and non-gaap income per share , both of which are non-gaap financial measures . we believe that these non-gaap measures provide useful information to management and investors regarding certain financial and business trends relating to our financial condition and results of operations . our management uses these non-gaap measures to compare the company 's performance to that of prior periods for trend analyses and planning purposes . adjusted ebitda is also used for purposes of determining executive and senior management incentive compensation . these measures are also presented to our board of directors . these non-gaap measures should not be considered a substitute for , or superior to , financial measures calculated in accordance with generally accepted accounting principles in the united states of america . these 35 non-gaap financial measures exclude significant expenses and income that are required by gaap to be recorded in the company 's financial statements and are subject to inherent limitations . investors should review the reconciliations of non-gaap financial measures to the comparable gaap financial measures that are included in this management 's discussion and analysis of financial condition and results of operations. critical accounting policies and estimates the discussion of our financial condition and results of operations is based upon our financial statements , which are prepared in accordance with accounting principles generally accepted in the united states of america , or gaap . the preparation of these financial statements requires us to make estimates , judgments and assumptions that affect the reported amounts of assets , liabilities , revenues , costs and expenses and related disclosures . on an ongoing basis , we evaluate our estimates and assumptions . we base our estimates of the carrying value of certain assets and liabilities on historical experience and on various other assumptions that we believe to be reasonable . our actual results may differ from these estimates under different assumptions or conditions . we believe that of our significant accounting policies , which are described in the notes to our financial statements , the following accounting policies involve a greater degree of judgment , complexity and effect on materiality . story_separator_special_tag 41 sales and marketing expenses . sales and marketing expenses for 2014 increased $ 7.4 million , or 19 % , to $ 47.0 million from $ 39.6 million for 2013. this increase was primarily due to increased headcount in 2014 , which resulted in higher personnel-related costs of $ 3.3 million , commissions earned by sales personnel from new business of $ 2.3 million , occupancy costs of $ 569,000 and stock based compensation expense of $ 452,000. we also had increased promotional costs of $ 305,000 and depreciation expense of $ 299,000 in 2014 as compared to 2013. as a percentage of revenues , sales and marketing expenses were 37 % for 2014 compared to 38 % for 2013. as we expand our business , we will continue to add resources to our sales and marketing efforts over time , and we expect that these expenses will continue to increase in absolute dollars . research and development expenses . research and development expenses for 2014 increased $ 2.6 million , or 24 % , to $ 13.5 million from $ 10.9 million for 2013. this increase was primarily due to increased headcount in 2014 which resulted in higher personnel-related costs of $ 2.0 million , occupancy costs of $ 226,000 and stock based compensation expense of $ 173,000. we also incurred higher expenses for software and cloud based subscriptions of approximately $ 180,000 in 2014 as compared to 2013. as a percentage of revenues , research and development expenses were 11 % for 2014 , compared to 10 % for 2013. as we enhance and expand our solutions and applications , we expect that research and development expenses will continue to increase in absolute dollars . general and administrative expenses . general and administrative expenses for 2014 increased $ 3.0 million , or 18 % , to $ 20.2 million from $ 17.2 million for 2013. this increase was primarily due to increased headcount in 2014 which resulted in higher personnel-related costs of $ 707,000 , occupancy costs of $ 188,000 and stock based compensation expense of $ 423,000. the increase was also due to increased legal costs , including costs related to the leadtec acquisition of $ 692,000 and computer software and hardware maintenance of $ 358,000 in 2014 as compared to 2013. as a percentage of revenues , general and administrative expenses were 16 % for 2014 , compared to 17 % for 2013. going forward , we expect that general and administrative expenses will continue to increase in absolute dollars as we expand our business . amortization of intangible assets . amortization of intangible assets for 2014 decreased $ 302,000 from 2013. amortization expense for 2013 included $ 290,000 for the impairment of a certain non-competition agreement . other expense . other expense for 2014 included $ 338,000 for a one-time australian stamp duty tax related to the leadtec acquisition in october 2014. income tax expense . our 2014 provision for income taxes was $ 1.4 million and included current federal , state and foreign income taxes as well as deferred federal and state income taxes . our 2013 provision for income taxes was $ 686,000 and included current state and foreign income taxes as well as deferred federal and state income taxes . it also included a one-time tax benefit for the retroactive benefit of the 2012 federal r & d credit . if this one-time tax benefit were excluded , our 2013 provision for income taxes would have been $ 803,000. see note k to our consolidated financial statements , included in this annual report on form 10-k , for additional information regarding our income taxes . 42 adjusted ebitda . adjusted ebitda , which is a non-gaap measure of financial performance , consists of net income plus depreciation and amortization , interest expense , interest income , income tax expense , stock-based compensation expense and other adjustments as necessary for a fair presentation . other adjustments included the impact of a one-time australian stamp duty tax related to the leadtec acquisition in 2014 , as well as the impact of use tax refunds in 2014 and 2013 related to items previously expensed . the following table provides a reconciliation of net income to adjusted ebitda ( in thousands ) : replace_table_token_13_th non-gaap income per share . non-gaap income per share , which is also a non-gaap measure of financial performance , consists of net income plus stock-based compensation expense and amortization expense related to intangible assets divided by the weighted average number of shares of common stock outstanding during each period . the following table provides a reconciliation of net income to non-gaap income per share ( in thousands , except per share amounts ) : replace_table_token_14_th story_separator_special_tag style= `` margin-top:12px ; margin-bottom:0px ; text-indent:4 % `` > during the last three years , inflation and changing prices have not had a material effect on our business and we do not expect that inflation or changing prices will materially affect our business in the foreseeable future . off-balance sheet arrangements we do not have any off-balance sheet arrangements , investments in special purpose entities or undisclosed borrowings or debt . additionally , we are not a party to any derivative contracts or synthetic leases . contractual and commercial commitment summary our contractual obligations and commercial commitments as of december 31 , 2015 are summarized below : replace_table_token_15_th seasonality the size and breadth of our customer base mitigates the seasonality of any particular retailer . as a result , our results of operations are not materially affected by seasonality . recent accounting pronouncements in may 2014 , the fasb issued asu no . 2014-09 , revenue from contracts with customers ( topic 606 ) , which requires an entity to recognize the amount of revenue to which it expects to be entitled for the transfer of promised goods or services to customers accounting requirements for the recognition of revenue from contracts with customers

