the enterprise software ( “ es ” ) segment provides municipal and county governments and schools with software systems and services to meet their information technology and automation needs for mission-critical “ back-office ” functions such as : financial management ; courts and justice processes ; public safety ; planning , regulatory and maintenance ; land and vital records management ; and data analytics . the appraisal and tax ( “ a & t ” ) segment provides systems and software that automate the appraisal and assessment of real and personal property as well as property appraisal outsourcing services for local governments and taxing authorities . property appraisal outsourcing services include : the physical inspection of commercial and residential properties ; data collection and processing ; computer analysis for property valuation ; preparation of tax rolls ; community education ; and arbitration between taxpayers and the assessing jurisdiction . 21 our total employee count increased to 4,525 at december 31 , 2018 , from 4,069 at december 31 , 2017 . for the twelve months ended december 31 , 2018 , total revenues increased 11 % compared to the prior year . organic revenue growth was 9 % for the twelve months ended december 31 , 2018 , compared to the prior year period and revenues from acquisitions contributed 2 % of growth for the twelve months ended december 31 , 2018 . subscriptions revenue grew 28 % for the twelve months ended december 31 , 2018 , due to a gradual shift toward cloud-based , software as a service business , as well as continued strong growth in our e-filing revenues from courts and the addition of new subscription revenues from the acquisition of socrata . organic subscriptions revenue increased 21 % for the twelve months ended december 31 , 2018 . our backlog at december 31 , 2018 was $ 1.25 billion , a 2 % increase from last year . recent acquisitions on december 7 , 2018 , we acquired certain assets and intellectual property of scenedoc , inc. ( `` scenedoc `` ) , a company that provides mobile-first , software-as-a-service ( saas ) field reporting for law enforcement agencies . the total purchase price was approximately $ 6.2 million , of which $ 5.4 million was paid in cash and approximately $ 759,000 accrued for a working capital holdback . as of december 31 , 2018 , the purchase price allocation for scenedoc is not yet complete . the preliminary estimates of fair value assumed at the acquisition date for intangible assets , receivables and deferred revenue and related deferred taxes are subject to change as valuations are finalized . on october 1 , 2018 , we acquired all of the equity interests of trademaster , inc. dba mobileeyes ( `` mobileeyes `` ) , a company that develops software to improve public safety by supporting fire prevention and suppression , emergency response , and structural safety . the total purchase price was approximately $ 5.3 million in cash . on august 31 , 2018 , we acquired all of the assets of caseloadpro , l. p. ( `` caseloadpro `` ) , a company that provides a fully featured probation case management system . the purchase price of $ 9.3 million was paid in cash . on april 30 , 2018 , we acquired all of the capital stock of socrata , inc. ( `` socrata `` ) , a company that provides open data and data-as-a-service solutions including cloud-based data integration , visualization , analysis , and reporting solutions for federal , state and local government agencies . the purchase price , net of cash acquired of $ 1.7 million , was $ 147.6 million in cash . on april 30 , 2018 , we acquired all of the equity interests of sage data security , llc ( `` sage `` ) , a cybersecurity company offering a suite of services that supports an entire cybersecurity lifecycle , including program development , education and training , technical testing , advisory services , and digital forensics . the total purchase price was $ 11.6 million paid in cash . as of december 31 , 2018 , the purchase price allocations for sage , socrata , caseloadpro , and mobileeyes are complete . the operating results of all 2018 acquisitions are included with the operating results of the enterprise software segment since their date of acquisition . revenues from socrata included in tyler 's results of operations totaled approximately $ 13.9 million and the net loss was $ 11.5 million for the twelve months ended december 31 , 2018 . the impact of the sage , caseloadpro , mobileeyes and scenedoc acquisitions , individually and in the aggregate , on our operating results , assets and liabilities is not material . our balance sheet as of december 31 , 2018 , reflects the allocation of the purchase price to the assets acquired based on their fair value at the date of each acquisition . the fair value of the assets and liabilities acquired are based on valuations using level iii , unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities . we monitor and analyze several key performance indicators in order to manage our business and evaluate our financial and operating performance . these indicators include the following : revenues – we derive our revenues from five primary sources : sale of software licenses and royalties ; subscription-based arrangements ; software services ; maintenance ; and appraisal services . subscriptions and maintenance are considered recurring revenue sources and comprised approximately 65 % of our revenue in 2018 . the number of new saas clients and the number of existing clients who convert from our traditional software arrangements to our saas model are a significant driver to our business , together with new software license sales and maintenance rate increases . story_separator_special_tag the assessment of recoverability or of the estimated useful life for amortization purposes will be affected if the timing or the amount of estimated future operating cash flows is not achieved . such indicators may include , among others : a significant decline in expected future cash flows ; a sustained , significant decline in stock price and market capitalization ; a significant adverse change in legal factors or in the business climate ; unanticipated competition ; and reductions in growth rates . in addition , products , capabilities , or technologies developed by others may render our software products obsolete or non-competitive . any adverse change in these factors could have a significant impact on the recoverability of goodwill or other intangible assets . share-based compensation . we have a stock incentive plan that provides for the grant of stock options , restricted stock units and performance stock units to key employees , directors and non-employee consultants . we estimate the fair value of share-based awards on the date of grant . share-based compensation expense includes the estimated effects of forfeitures , which will be adjusted over the requisite service period to the extent actual forfeitures differ or are expected to differ from such estimates . changes in estimated forfeitures are recognized in the period of change and will also impact the amount of expense to be recognized in future periods . forfeiture rate assumptions are derived from historical data . we estimate stock price volatility at the date of grant based on the historical volatility of our common stock . estimated option life is determined using the weighted-average period the stock options are expected to be outstanding based primarily on the options ' vesting terms , remaining contractual life and the employees ' expected exercise based on historical patterns . determining the appropriate fair-value model and calculating the fair value of share-based awards at the grant date requires considerable judgment , including estimating stock price volatility , expected option life and forfeiture rates . 26 analysis of results of operations and other the following discussion compares the historical results of operations on a basis consistent with gaap for the years ended december 31 , 2018 , 2017 and 2016 . replace_table_token_2_th 27 2018 compared to 2017 revenues on april 30 , 2018 , we acquired socrata , a company that provides open data and data-as-a-service solutions for federal , state and local government agencies including cloud-based data integration , visualization , analysis , and reporting solutions . the following table details revenue for socrata for the periods presented as of december 31 , 2018 , which is included in our consolidated statements of income : 2018 revenues : software licenses and royalties $ — subscriptions 12,106 software services 1,751 maintenance — appraisal services — hardware and other 20 total revenues $ 13,877 on december 7 , 2018 , we acquired scenedoc , inc. , a company that provides mobile-first , software-as-a-service ( saas ) field reporting for law enforcement agencies . on october 1 , 2018 , we acquired mobileeyes , a company that develops software to improve public safety by supporting fire prevention and suppression , emergency response , and structural safety . on august 31 , 2018 , we acquired caseloadpro , a company that provides a fully featured probation case management system . on april 30 , 2018 , we also acquired sage , a cybersecurity company offering a suite of services that supports an entire cybersecurity lifecycle . the impact of these acquisitions on our operating results is not considered material , individually and in the aggregate , and is not included in the table above . the results of these acquisitions are included with the operating results of the es segment from their dates of acquisition . for comparative purposes , we have provided explanations for changes in operations to exclude results of operations for these acquisitions noting the exclusion . software licenses and royalties . the following table sets forth a comparison of our software licenses and royalties revenue for the years ended december 31 : replace_table_token_3_th software license and royalties revenue grew 8 % compared to the prior year . the majority of this growth was due to an active marketplace as the result of generally positive local government economic conditions , as well as our increasingly strong competitive position , which we attribute in part to our investment in product development in recent years . an increase in the number of larger contracts related to our planning , regulatory and maintenance solutions and public safety solutions also contributed to the growth in license revenue . although the mix of new contracts between subscription-based and perpetual license arrangements may vary from quarter to quarter and year to year , we expect our longer-term software license growth rate to be negatively impacted by a growing number of customers choosing our subscription-based options , rather than purchasing the software under a traditional perpetual software license arrangement . subscription-based arrangements result in lower software license revenue in the initial year as compared to perpetual software license arrangements but generate higher overall revenue over the term of the contract . our new client mix in 2018 was approximately 47 % selecting perpetual software license arrangements and approximately 53 % selecting subscription-based arrangements compared to a client mix in 2017 of approximately 53 % selecting perpetual software license arrangements and approximately 47 % selecting subscription-based arrangements . 28 subscriptions . the following table sets forth a comparison of our subscriptions revenue for the years ended december 31 : replace_table_token_4_th subscription-based revenue primarily consists of revenue derived from our saas arrangements , which generally utilize the tyler private cloud . as part of our subscription-based services , we also provide electronic document filing solutions ( “ e-filing ” ) that simplify the filing and management of court related documents for courts and law offices . e-filing revenue is derived from transaction fees and fixed fee arrangements .

financial condition and liquidity as of december 31 , 2018 , we had cash and cash equivalents of $ 134.3 million compared to $ 185.9 million at december 31 , 2017 . we also had $ 97.7 million invested in investment grade corporate bonds , municipal bonds and asset-backed securities as of december 31 , 2018 compared to $ 63.8 million at december 31 , 2017 . these investments mature between 2018 through 2022 and we intend to hold these investments until maturity . cash and cash equivalents consist of cash on deposit with several domestic banks and money market funds . as of december 31 , 2018 , we had no outstanding borrowings and no outstanding letters of credit . we believe our revolving line of credit , cash from operating activities , cash on hand and access to the credit markets provide us with sufficient flexibility to meet our long-term financial needs . the following table sets forth a summary of cash flows for the years ended december 31 : replace_table_token_20_th net cash provided by operating activities continues to be our primary source of funds to finance operating needs and capital expenditures . other potential capital resources include cash on hand , public and private issuances of debt or equity securities , and bank borrowings . it is possible that our ability to access the capital and credit markets in the future may be limited by economic conditions or other factors .


 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.
     ```financial condition and liquidity as of december 31 , 2018 , we had cash and cash equivalents of $ 134.3 million compared to $ 185.9 million at december 31 , 2017 . we also had $ 97.7 million invested in investment grade corporate bonds , municipal bonds and asset-backed securities as of december 31 , 2018 compared to $ 63.8 million at december 31 , 2017 . these investments mature between 2018 through 2022 and we intend to hold these investments until maturity . cash and cash equivalents consist of cash on deposit with several domestic banks and money market funds . as of december 31 , 2018 , we had no outstanding borrowings and no outstanding letters of credit . we believe our revolving line of credit , cash from operating activities , cash on hand and access to the credit markets provide us with sufficient flexibility to meet our long-term financial needs . the following table sets forth a summary of cash flows for the years ended december 31 : replace_table_token_20_th net cash provided by operating activities continues to be our primary source of funds to finance operating needs and capital expenditures . other potential capital resources include cash on hand , public and private issuances of debt or equity securities , and bank borrowings . it is possible that our ability to access the capital and credit markets in the future may be limited by economic conditions or other factors .
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 Suspicious Activity Report : the enterprise software ( “ es ” ) segment provides municipal and county governments and schools with software systems and services to meet their information technology and automation needs for mission-critical “ back-office ” functions such as : financial management ; courts and justice processes ; public safety ; planning , regulatory and maintenance ; land and vital records management ; and data analytics . the appraisal and tax ( “ a & t ” ) segment provides systems and software that automate the appraisal and assessment of real and personal property as well as property appraisal outsourcing services for local governments and taxing authorities . property appraisal outsourcing services include : the physical inspection of commercial and residential properties ; data collection and processing ; computer analysis for property valuation ; preparation of tax rolls ; community education ; and arbitration between taxpayers and the assessing jurisdiction . 21 our total employee count increased to 4,525 at december 31 , 2018 , from 4,069 at december 31 , 2017 . for the twelve months ended december 31 , 2018 , total revenues increased 11 % compared to the prior year . organic revenue growth was 9 % for the twelve months ended december 31 , 2018 , compared to the prior year period and revenues from acquisitions contributed 2 % of growth for the twelve months ended december 31 , 2018 . subscriptions revenue grew 28 % for the twelve months ended december 31 , 2018 , due to a gradual shift toward cloud-based , software as a service business , as well as continued strong growth in our e-filing revenues from courts and the addition of new subscription revenues from the acquisition of socrata . organic subscriptions revenue increased 21 % for the twelve months ended december 31 , 2018 . our backlog at december 31 , 2018 was $ 1.25 billion , a 2 % increase from last year . recent acquisitions on december 7 , 2018 , we acquired certain assets and intellectual property of scenedoc , inc. ( `` scenedoc `` ) , a company that provides mobile-first , software-as-a-service ( saas ) field reporting for law enforcement agencies . the total purchase price was approximately $ 6.2 million , of which $ 5.4 million was paid in cash and approximately $ 759,000 accrued for a working capital holdback . as of december 31 , 2018 , the purchase price allocation for scenedoc is not yet complete . the preliminary estimates of fair value assumed at the acquisition date for intangible assets , receivables and deferred revenue and related deferred taxes are subject to change as valuations are finalized . on october 1 , 2018 , we acquired all of the equity interests of trademaster , inc. dba mobileeyes ( `` mobileeyes `` ) , a company that develops software to improve public safety by supporting fire prevention and suppression , emergency response , and structural safety . the total purchase price was approximately $ 5.3 million in cash . on august 31 , 2018 , we acquired all of the assets of caseloadpro , l. p. ( `` caseloadpro `` ) , a company that provides a fully featured probation case management system . the purchase price of $ 9.3 million was paid in cash . on april 30 , 2018 , we acquired all of the capital stock of socrata , inc. ( `` socrata `` ) , a company that provides open data and data-as-a-service solutions including cloud-based data integration , visualization , analysis , and reporting solutions for federal , state and local government agencies . the purchase price , net of cash acquired of $ 1.7 million , was $ 147.6 million in cash . on april 30 , 2018 , we acquired all of the equity interests of sage data security , llc ( `` sage `` ) , a cybersecurity company offering a suite of services that supports an entire cybersecurity lifecycle , including program development , education and training , technical testing , advisory services , and digital forensics . the total purchase price was $ 11.6 million paid in cash . as of december 31 , 2018 , the purchase price allocations for sage , socrata , caseloadpro , and mobileeyes are complete . the operating results of all 2018 acquisitions are included with the operating results of the enterprise software segment since their date of acquisition . revenues from socrata included in tyler 's results of operations totaled approximately $ 13.9 million and the net loss was $ 11.5 million for the twelve months ended december 31 , 2018 . the impact of the sage , caseloadpro , mobileeyes and scenedoc acquisitions , individually and in the aggregate , on our operating results , assets and liabilities is not material . our balance sheet as of december 31 , 2018 , reflects the allocation of the purchase price to the assets acquired based on their fair value at the date of each acquisition . the fair value of the assets and liabilities acquired are based on valuations using level iii , unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities . we monitor and analyze several key performance indicators in order to manage our business and evaluate our financial and operating performance . these indicators include the following : revenues – we derive our revenues from five primary sources : sale of software licenses and royalties ; subscription-based arrangements ; software services ; maintenance ; and appraisal services . subscriptions and maintenance are considered recurring revenue sources and comprised approximately 65 % of our revenue in 2018 . the number of new saas clients and the number of existing clients who convert from our traditional software arrangements to our saas model are a significant driver to our business , together with new software license sales and maintenance rate increases . story_separator_special_tag the assessment of recoverability or of the estimated useful life for amortization purposes will be affected if the timing or the amount of estimated future operating cash flows is not achieved . such indicators may include , among others : a significant decline in expected future cash flows ; a sustained , significant decline in stock price and market capitalization ; a significant adverse change in legal factors or in the business climate ; unanticipated competition ; and reductions in growth rates . in addition , products , capabilities , or technologies developed by others may render our software products obsolete or non-competitive . any adverse change in these factors could have a significant impact on the recoverability of goodwill or other intangible assets . share-based compensation . we have a stock incentive plan that provides for the grant of stock options , restricted stock units and performance stock units to key employees , directors and non-employee consultants . we estimate the fair value of share-based awards on the date of grant . share-based compensation expense includes the estimated effects of forfeitures , which will be adjusted over the requisite service period to the extent actual forfeitures differ or are expected to differ from such estimates . changes in estimated forfeitures are recognized in the period of change and will also impact the amount of expense to be recognized in future periods . forfeiture rate assumptions are derived from historical data . we estimate stock price volatility at the date of grant based on the historical volatility of our common stock . estimated option life is determined using the weighted-average period the stock options are expected to be outstanding based primarily on the options ' vesting terms , remaining contractual life and the employees ' expected exercise based on historical patterns . determining the appropriate fair-value model and calculating the fair value of share-based awards at the grant date requires considerable judgment , including estimating stock price volatility , expected option life and forfeiture rates . 26 analysis of results of operations and other the following discussion compares the historical results of operations on a basis consistent with gaap for the years ended december 31 , 2018 , 2017 and 2016 . replace_table_token_2_th 27 2018 compared to 2017 revenues on april 30 , 2018 , we acquired socrata , a company that provides open data and data-as-a-service solutions for federal , state and local government agencies including cloud-based data integration , visualization , analysis , and reporting solutions . the following table details revenue for socrata for the periods presented as of december 31 , 2018 , which is included in our consolidated statements of income : 2018 revenues : software licenses and royalties $ — subscriptions 12,106 software services 1,751 maintenance — appraisal services — hardware and other 20 total revenues $ 13,877 on december 7 , 2018 , we acquired scenedoc , inc. , a company that provides mobile-first , software-as-a-service ( saas ) field reporting for law enforcement agencies . on october 1 , 2018 , we acquired mobileeyes , a company that develops software to improve public safety by supporting fire prevention and suppression , emergency response , and structural safety . on august 31 , 2018 , we acquired caseloadpro , a company that provides a fully featured probation case management system . on april 30 , 2018 , we also acquired sage , a cybersecurity company offering a suite of services that supports an entire cybersecurity lifecycle . the impact of these acquisitions on our operating results is not considered material , individually and in the aggregate , and is not included in the table above . the results of these acquisitions are included with the operating results of the es segment from their dates of acquisition . for comparative purposes , we have provided explanations for changes in operations to exclude results of operations for these acquisitions noting the exclusion . software licenses and royalties . the following table sets forth a comparison of our software licenses and royalties revenue for the years ended december 31 : replace_table_token_3_th software license and royalties revenue grew 8 % compared to the prior year . the majority of this growth was due to an active marketplace as the result of generally positive local government economic conditions , as well as our increasingly strong competitive position , which we attribute in part to our investment in product development in recent years . an increase in the number of larger contracts related to our planning , regulatory and maintenance solutions and public safety solutions also contributed to the growth in license revenue . although the mix of new contracts between subscription-based and perpetual license arrangements may vary from quarter to quarter and year to year , we expect our longer-term software license growth rate to be negatively impacted by a growing number of customers choosing our subscription-based options , rather than purchasing the software under a traditional perpetual software license arrangement . subscription-based arrangements result in lower software license revenue in the initial year as compared to perpetual software license arrangements but generate higher overall revenue over the term of the contract . our new client mix in 2018 was approximately 47 % selecting perpetual software license arrangements and approximately 53 % selecting subscription-based arrangements compared to a client mix in 2017 of approximately 53 % selecting perpetual software license arrangements and approximately 47 % selecting subscription-based arrangements . 28 subscriptions . the following table sets forth a comparison of our subscriptions revenue for the years ended december 31 : replace_table_token_4_th subscription-based revenue primarily consists of revenue derived from our saas arrangements , which generally utilize the tyler private cloud . as part of our subscription-based services , we also provide electronic document filing solutions ( “ e-filing ” ) that simplify the filing and management of court related documents for courts and law offices . e-filing revenue is derived from transaction fees and fixed fee arrangements .

