we believe that our continued innovation and new solutions , such as online benefits marketplaces , also known as private exchanges , enhanced mobile offerings , and more robust data analytics capabilities will help us attract additional large employer customers and increase our revenue from existing customers . we believe that there is a substantial market for our services , and we have been investing in growth over the past four years . in particular , we have continued to invest in technology and services to better serve our larger employer customers , which we believe are an important source of growth for our business . we have also substantially increased our marketing and sales efforts and expect those increased efforts to continue . as we have invested in growth , we have had operating losses in each of the last five years , and expect our operating losses to continue for at least the next year . due to the nature of our customer relationships , which have been very stable with relatively few customer losses over the past years , and the subscription nature of our financial model , we believe that our current investment in growth should lead to substantially increased revenue , which will allow us to achieve profitability in the relatively near future . of course , our ability to achieve profitability will continue to be subject to many factors beyond our control . key financial and operating performance metrics we regularly monitor a number of financial and operating metrics in order to measure our current performance and project our future performance . these metrics help us develop and refine our growth strategies and make strategic decisions . we discuss revenue , gross margin , and the components of operating loss , as well as segment revenue and segment gross profit , in management 's discussion and analysis of financial condition and results of operationscomponents of operating results . in addition , we utilize other key metrics as described below . number of large employer and carrier customers we believe the number of large employer and carrier customers is a key indicator of our market penetration , growth , and future revenue . we have aggressively invested in and intend to continue to invest in our direct sales force to grow our customer base . we generally define a customer as an entity with an active software services contract as of the measurement date . the following table sets forth the number of large employer and carrier customers for the periods indicated : replace_table_token_8_th 56 software services revenue retention rate we believe that our ability to retain our customers and expand the revenue they generate for us over time is an important component of our growth strategy and reflects the long-term value of our customer relationships . we measure our performance on this basis using a metric we refer to as our software services revenue retention rate . we calculate this metric for a particular period by establishing the group of our customers that had active contracts for a given period . we then calculate our software services revenue retention rate by taking the amount of software services revenue we recognized for this group in the subsequent comparable period ( for which we are reporting the rate ) and dividing it by the software services revenue we recognized for the group in the prior period . for 2015 , 2014 and 2013 our software services revenue retention rate exceeded 95 % . adjusted ebitda adjusted ebitda represents our earnings before net interest and other expense , taxes , and depreciation and amortization expense , adjusted to eliminate stock-based compensation and impairment of goodwill and intangible assets . adjusted ebitda is not a measure calculated in accordance with united states generally accepted accounting principles , or gaap . please refer to selected consolidated financial data in this report for a discussion of the limitations of adjusted ebitda and reconciliation of adjusted ebitda to net loss , the most comparable gaap measurement , respectively , for 2015 , 2014 and 2013. components of operating results revenue we derive the majority of our revenue from software services fees , which consist primarily of monthly subscription fees paid to us by our employer and carrier customers for access to , and usage of , our cloud-based benefits software solutions for a specified contract term . we also derive revenue from professional services fees , which primarily include fees related to the implementation of our customers onto our platform . our professional services typically include discovery , configuration and deployment , integration , testing , and training . the following table sets forth a breakdown of our revenue between software services and professional services for the periods indicated ( in thousands ) : replace_table_token_9_th we generally recognize software services fees monthly based on the number of employees covered by the relevant benefits plans at contracted rates for a specified period of time , provided that an enforceable contract has been signed by both parties , access to our software has been granted to the customer and it is available for their use , the fee for the software services is fixed or determinable , and collection is reasonably assured . we defer recognition of our professional services fees paid by customers related to implementation services that are determined to not have stand-alone value and are sold with our software services , and recognize them , beginning once the software services have commenced , ratably over the longer of the contract term or the estimated expected life of the customer relationship , which was 7 years in 2015 and 10 years in 2014 and 2013. we periodically evaluate the term over which revenue is recognized for professional services as we gain more experience with customer contract renewals . story_separator_special_tag we also experienced a to a $ 2.5 million increase in consulting and professional fees and insurance related to being a publicly traded company . in addition , we experienced a $ 1.1 million increase related primarily to increases in facilities and overhead costs . comparison of years ended december 31 , 2014 and 2013 revenue replace_table_token_20_th growth in software services revenue was primarily attributable to the addition of new customers , as the number of large employer and carrier customers increased to 596 as of december 31 , 2014 from 433 as of december 31 , 2013. our professional services revenue increased in absolute terms between the year ended december 31 , 2013 and the year ended december 31 , 2014 , primarily due to revenue recognized from newly completed implementations of $ 3.2 million in addition to $ 2.1 million from the acceleration of the customer relationship period for customers that did not renew their contracts . segment revenue replace_table_token_21_th the growth in our employer revenue was primarily attributable to a $ 20.0 million increase in our employer software services revenue driven primarily by an increase in the number of large employer customers using our platform as of december 31 , 2014 as compared to december 31 , 2013. additionally , employer professional services contributed an increase of $ 1.4 million primarily related to newly completed implementations . the growth in our carrier revenue was primarily attributable to an increase of $ 7.3 million in our carrier software services revenue driven primarily by an increase in software services revenue from recent customer product implementations during the year ended december 31 , 2014 as compared to the year ended december 31 , 2013. the remaining increase of $ 4.0 million is related to carrier 65 professional services and is comprised of an increase of $ 1.9 million in revenue related to customers who went live on the platform and $ 2.1 million related to the acceleration of the customer relationship period for customers that did not renew their contracts . cost of revenue replace_table_token_22_th the increase in cost of revenue was in part attributable to an $ 18.6 million increase in salaries and personnel-related costs and professional fees , including an increase of $ 0.7 million related to stock-based compensation , of which $ 16.0 million was associated with increased client service capacity to support our growing number of customers and an increase in engineering costs of $ 1.2 million . also , we experienced a $ 6.4 million increase in infrastructure maintenance costs to support our platform and additional depreciation and amortization and facilities costs related to the increase in the number of employees . gross profit replace_table_token_23_th the increase in software services gross profit in absolute terms was driven by a $ 27.4 million , or 28.0 % , increase in software services revenue . this increase was partially offset by a $ 13.7 million , or 37.9 % , increase in software services cost of revenue . software services cost of revenue included $ 0.4 million and $ 0.1 million of stock-based compensation expense for the years ended december 31 , 2014 and 2013 , respectively , and $ 7.2 million and $ 6.7 million of depreciation and amortization for the years ended december 31 , 2014 and 2013 , respectively . the increase in professional services gross loss was driven by an $ 11.4 million , or 43.3 % , increase in professional services cost of revenue , partially offset by an increase in professional services revenue of $ 5.3 million . professional services cost of revenue included $ 0.5 million and $ 0.2 million of stock-based compensation expense for the years ended december 31 , 2014 and 2013 , respectively . in addition , professional services cost of revenue included $ 0.8 million and $ 0.4 million in depreciation and amortization for the years ended december 31 , 2014 and 2013 , respectively . as discussed in components of operating resultscost of revenue , our cost of revenue is expensed as we incur the costs . however , the related revenue from fees we receive for our implementation services performed before a customer is operating on our platform is deferred until the commencement of the monthly subscription and recognized as revenue ratably over the longer of the related contract term or the estimated expected life of the customer relationship , which is 10 years for the years presented . therefore , the cost incurred in providing these services is expensed in periods prior to the 66 recognition of the corresponding revenue . for this reason , as well as due to the personnel-related costs associated with providing implementation services , our cost associated with providing implementation services has been significantly higher as a percentage of related revenue than our cost associated with providing our monthly subscription services . segment gross profit replace_table_token_24_th employer gross profit increased in absolute terms by $ 2.9 million , or 21.6 % , between the year ended december 31 , 2013 and the year ended december 31 , 2014. the $ 21.4 million , or 52.5 % , increase in employer revenue was offset by an $ 18.5 million , or 67.6 % , increase in employer cost of revenue . the increase in cost of revenue is attributable to costs associated with supporting the increased number of employer customers live on the platform and the increased cost of providing services , including customer implementations . our employer gross profit included $ 3.5 million and $ 2.5 million of depreciation and amortization for the years ended december 31 , 2014 and december 31 , 2013 , respectively . in addition , our employer gross profit included $ 0.5 million and $ 0.1 million of stock-based compensation expense for the years ended december 31 , 2014 and 2013 , respectively . carrier gross profit increased by $ 4.7 million , or 16.3 % , between the year ended december 31

cash flows our cash flows for the years ended december 31 , 2015 , 2014 , and 2013 were as follows : replace_table_token_27_th operating activities cash flows from operations decreased $ 12.7 million during 2015 to $ ( 31.5 ) million , as changes in working capital provided $ 1.3 million cash and adjustments for non-cash items of $ 29.3 million partially offset a net loss of $ ( 62.1 ) million . the cash provided by changes in working capital primarily consisted of an increase in accrued compensation and benefits of $ 3.3 million , an increase in accrued expenses of $ 3.0 million , and an increase in accounts payable of $ 3.4 million , offset by an increase in accounts receivable of $ 7.8 million . the increase in accrued compensation and benefits resulted from an increase in the number of associates . the increases in accrued expenses and accounts payable are 73 the result of timing of the receipt of invoices and the timing of payments . the increase in accounts receivable resulted from a few significant invoices related to new contracts and the normal timing of customer payments . for the year ended december 31 , 2014 , our operating activities used $ 18.9 million of cash , as $ 24.8 million of cash provided by changes in working capital and $ 19.5 million in adjustments for non-cash items , were more than offset by a net loss of $ 63.2 million . adjustments for non-cash items primarily consisted of depreciation and amortization expense of $ 9.5 million , non-cash stock compensation expense of $ 5.6 million , change in fair value and accretion of warrant of $ 0.7 million , and accrual of interest on financing obligations of $ 3.6 million . the cash provided by changes in working capital primarily consisted of an increase in deferred revenue of $ 14.3 million , an increase in accrued compensation and benefits of $ 3.2 million , an increase in accrued expenses of $ 2.5 million , and a decrease in accounts receivable of $ 2.4 million .


 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 our cash flows for the years ended december 31 , 2015 , 2014 , and 2013 were as follows : replace_table_token_27_th operating activities cash flows from operations decreased $ 12.7 million during 2015 to $ ( 31.5 ) million , as changes in working capital provided $ 1.3 million cash and adjustments for non-cash items of $ 29.3 million partially offset a net loss of $ ( 62.1 ) million . the cash provided by changes in working capital primarily consisted of an increase in accrued compensation and benefits of $ 3.3 million , an increase in accrued expenses of $ 3.0 million , and an increase in accounts payable of $ 3.4 million , offset by an increase in accounts receivable of $ 7.8 million . the increase in accrued compensation and benefits resulted from an increase in the number of associates . the increases in accrued expenses and accounts payable are 73 the result of timing of the receipt of invoices and the timing of payments . the increase in accounts receivable resulted from a few significant invoices related to new contracts and the normal timing of customer payments . for the year ended december 31 , 2014 , our operating activities used $ 18.9 million of cash , as $ 24.8 million of cash provided by changes in working capital and $ 19.5 million in adjustments for non-cash items , were more than offset by a net loss of $ 63.2 million . adjustments for non-cash items primarily consisted of depreciation and amortization expense of $ 9.5 million , non-cash stock compensation expense of $ 5.6 million , change in fair value and accretion of warrant of $ 0.7 million , and accrual of interest on financing obligations of $ 3.6 million . the cash provided by changes in working capital primarily consisted of an increase in deferred revenue of $ 14.3 million , an increase in accrued compensation and benefits of $ 3.2 million , an increase in accrued expenses of $ 2.5 million , and a decrease in accounts receivable of $ 2.4 million .
```    
 Suspicious Activity Report : we believe that our continued innovation and new solutions , such as online benefits marketplaces , also known as private exchanges , enhanced mobile offerings , and more robust data analytics capabilities will help us attract additional large employer customers and increase our revenue from existing customers . we believe that there is a substantial market for our services , and we have been investing in growth over the past four years . in particular , we have continued to invest in technology and services to better serve our larger employer customers , which we believe are an important source of growth for our business . we have also substantially increased our marketing and sales efforts and expect those increased efforts to continue . as we have invested in growth , we have had operating losses in each of the last five years , and expect our operating losses to continue for at least the next year . due to the nature of our customer relationships , which have been very stable with relatively few customer losses over the past years , and the subscription nature of our financial model , we believe that our current investment in growth should lead to substantially increased revenue , which will allow us to achieve profitability in the relatively near future . of course , our ability to achieve profitability will continue to be subject to many factors beyond our control . key financial and operating performance metrics we regularly monitor a number of financial and operating metrics in order to measure our current performance and project our future performance . these metrics help us develop and refine our growth strategies and make strategic decisions . we discuss revenue , gross margin , and the components of operating loss , as well as segment revenue and segment gross profit , in management 's discussion and analysis of financial condition and results of operationscomponents of operating results . in addition , we utilize other key metrics as described below . number of large employer and carrier customers we believe the number of large employer and carrier customers is a key indicator of our market penetration , growth , and future revenue . we have aggressively invested in and intend to continue to invest in our direct sales force to grow our customer base . we generally define a customer as an entity with an active software services contract as of the measurement date . the following table sets forth the number of large employer and carrier customers for the periods indicated : replace_table_token_8_th 56 software services revenue retention rate we believe that our ability to retain our customers and expand the revenue they generate for us over time is an important component of our growth strategy and reflects the long-term value of our customer relationships . we measure our performance on this basis using a metric we refer to as our software services revenue retention rate . we calculate this metric for a particular period by establishing the group of our customers that had active contracts for a given period . we then calculate our software services revenue retention rate by taking the amount of software services revenue we recognized for this group in the subsequent comparable period ( for which we are reporting the rate ) and dividing it by the software services revenue we recognized for the group in the prior period . for 2015 , 2014 and 2013 our software services revenue retention rate exceeded 95 % . adjusted ebitda adjusted ebitda represents our earnings before net interest and other expense , taxes , and depreciation and amortization expense , adjusted to eliminate stock-based compensation and impairment of goodwill and intangible assets . adjusted ebitda is not a measure calculated in accordance with united states generally accepted accounting principles , or gaap . please refer to selected consolidated financial data in this report for a discussion of the limitations of adjusted ebitda and reconciliation of adjusted ebitda to net loss , the most comparable gaap measurement , respectively , for 2015 , 2014 and 2013. components of operating results revenue we derive the majority of our revenue from software services fees , which consist primarily of monthly subscription fees paid to us by our employer and carrier customers for access to , and usage of , our cloud-based benefits software solutions for a specified contract term . we also derive revenue from professional services fees , which primarily include fees related to the implementation of our customers onto our platform . our professional services typically include discovery , configuration and deployment , integration , testing , and training . the following table sets forth a breakdown of our revenue between software services and professional services for the periods indicated ( in thousands ) : replace_table_token_9_th we generally recognize software services fees monthly based on the number of employees covered by the relevant benefits plans at contracted rates for a specified period of time , provided that an enforceable contract has been signed by both parties , access to our software has been granted to the customer and it is available for their use , the fee for the software services is fixed or determinable , and collection is reasonably assured . we defer recognition of our professional services fees paid by customers related to implementation services that are determined to not have stand-alone value and are sold with our software services , and recognize them , beginning once the software services have commenced , ratably over the longer of the contract term or the estimated expected life of the customer relationship , which was 7 years in 2015 and 10 years in 2014 and 2013. we periodically evaluate the term over which revenue is recognized for professional services as we gain more experience with customer contract renewals . story_separator_special_tag we also experienced a to a $ 2.5 million increase in consulting and professional fees and insurance related to being a publicly traded company . in addition , we experienced a $ 1.1 million increase related primarily to increases in facilities and overhead costs . comparison of years ended december 31 , 2014 and 2013 revenue replace_table_token_20_th growth in software services revenue was primarily attributable to the addition of new customers , as the number of large employer and carrier customers increased to 596 as of december 31 , 2014 from 433 as of december 31 , 2013. our professional services revenue increased in absolute terms between the year ended december 31 , 2013 and the year ended december 31 , 2014 , primarily due to revenue recognized from newly completed implementations of $ 3.2 million in addition to $ 2.1 million from the acceleration of the customer relationship period for customers that did not renew their contracts . segment revenue replace_table_token_21_th the growth in our employer revenue was primarily attributable to a $ 20.0 million increase in our employer software services revenue driven primarily by an increase in the number of large employer customers using our platform as of december 31 , 2014 as compared to december 31 , 2013. additionally , employer professional services contributed an increase of $ 1.4 million primarily related to newly completed implementations . the growth in our carrier revenue was primarily attributable to an increase of $ 7.3 million in our carrier software services revenue driven primarily by an increase in software services revenue from recent customer product implementations during the year ended december 31 , 2014 as compared to the year ended december 31 , 2013. the remaining increase of $ 4.0 million is related to carrier 65 professional services and is comprised of an increase of $ 1.9 million in revenue related to customers who went live on the platform and $ 2.1 million related to the acceleration of the customer relationship period for customers that did not renew their contracts . cost of revenue replace_table_token_22_th the increase in cost of revenue was in part attributable to an $ 18.6 million increase in salaries and personnel-related costs and professional fees , including an increase of $ 0.7 million related to stock-based compensation , of which $ 16.0 million was associated with increased client service capacity to support our growing number of customers and an increase in engineering costs of $ 1.2 million . also , we experienced a $ 6.4 million increase in infrastructure maintenance costs to support our platform and additional depreciation and amortization and facilities costs related to the increase in the number of employees . gross profit replace_table_token_23_th the increase in software services gross profit in absolute terms was driven by a $ 27.4 million , or 28.0 % , increase in software services revenue . this increase was partially offset by a $ 13.7 million , or 37.9 % , increase in software services cost of revenue . software services cost of revenue included $ 0.4 million and $ 0.1 million of stock-based compensation expense for the years ended december 31 , 2014 and 2013 , respectively , and $ 7.2 million and $ 6.7 million of depreciation and amortization for the years ended december 31 , 2014 and 2013 , respectively . the increase in professional services gross loss was driven by an $ 11.4 million , or 43.3 % , increase in professional services cost of revenue , partially offset by an increase in professional services revenue of $ 5.3 million . professional services cost of revenue included $ 0.5 million and $ 0.2 million of stock-based compensation expense for the years ended december 31 , 2014 and 2013 , respectively . in addition , professional services cost of revenue included $ 0.8 million and $ 0.4 million in depreciation and amortization for the years ended december 31 , 2014 and 2013 , respectively . as discussed in components of operating resultscost of revenue , our cost of revenue is expensed as we incur the costs . however , the related revenue from fees we receive for our implementation services performed before a customer is operating on our platform is deferred until the commencement of the monthly subscription and recognized as revenue ratably over the longer of the related contract term or the estimated expected life of the customer relationship , which is 10 years for the years presented . therefore , the cost incurred in providing these services is expensed in periods prior to the 66 recognition of the corresponding revenue . for this reason , as well as due to the personnel-related costs associated with providing implementation services , our cost associated with providing implementation services has been significantly higher as a percentage of related revenue than our cost associated with providing our monthly subscription services . segment gross profit replace_table_token_24_th employer gross profit increased in absolute terms by $ 2.9 million , or 21.6 % , between the year ended december 31 , 2013 and the year ended december 31 , 2014. the $ 21.4 million , or 52.5 % , increase in employer revenue was offset by an $ 18.5 million , or 67.6 % , increase in employer cost of revenue . the increase in cost of revenue is attributable to costs associated with supporting the increased number of employer customers live on the platform and the increased cost of providing services , including customer implementations . our employer gross profit included $ 3.5 million and $ 2.5 million of depreciation and amortization for the years ended december 31 , 2014 and december 31 , 2013 , respectively . in addition , our employer gross profit included $ 0.5 million and $ 0.1 million of stock-based compensation expense for the years ended december 31 , 2014 and 2013 , respectively . carrier gross profit increased by $ 4.7 million , or 16.3 % , between the year ended december 31

