products incorporating our patented inventions in video include cellular phones , tablets , notebook computers , computers , televisions , gaming consoles , set-top boxes , streaming devices and other consumer electronics . interdigital derives revenues primarily from patent licensing , with smaller contributions from patent sales , product sales , technology solutions licensing and sales and engineering services . on january 1 , 2018 , we adopted the requirements of asu no . 2014-09 , `` revenue from contracts with customers ( topic 606 ) `` ( `` asc 606 `` ) using the modified retrospective method . refer to the `` revenue `` section below as well as note 3 , `` revenue recognition , `` within the consolidated financial statements for further information regarding our adoption of asc 606. acquisition of technicolor 's patent licensing business on july 30 , 2018 , we completed the technicolor acquisition . the final transaction includes the acquisition by interdigital of approximately 18,000 patents and applications , across a broad range of technologies , including approximately 3,000 worldwide video coding patents and applications . refer to note 5 , “ business combinations , ” within the consolidated financial statements for more information on this transaction . acquisition of technicolor 's research & innovation unit on february 11 , 2019 , we announced that we had made a binding offer to acquire the research & innovation ( `` r & i `` ) unit of technicolor sa . r & i is a premier research lab that conducts fundamental research into video coding , iot and smart home , imaging sciences , ar and vr and artificial intelligence and machine learning technologies . after completing the required prior consultation with technicolor 's works council , the companies expect to execute a definitive acquisition agreement , the terms of which have been negotiated . the transaction is expected to close in mid-2019 , subject to customary closing conditions . as consideration for the acquisition , the parties have agreed to terminate the jointly-funded r & d collaboration that was entered into as part of the technicolor acquisition . in addition , technicolor has agreed to reduce its rights to a revenue-sharing arrangement announced as part of the technicolor acquisition . there is no cash consideration . 39 revenue as discussed above , we adopted new revenue guidance , asc 606 , effective january 1 , 2018 using the modified retrospective method . this resulted in a cumulative adjustment of $ 161.3 million to retained earnings . consistent with the modified retrospective adoption method , our results of operations for periods prior to our adoption of asc 606 remain unchanged . as such , revenue is presented in accordance with asc 606 for the year ended december 31 , 2018 and in accordance with asc 605 for all prior periods presented . refer to note 3 , “ revenue recognition , ” within the consolidated financial statements for further information regarding our adoption of asc 606. the adoption of the new guidance affected our recognition of revenue from both our fixed-fee and per-unit license agreements . for accounting purposes under this new guidance , we separate our fixed-fee license agreements into two categories : ( i ) those agreements that provide rights , over the term of the license , to future technologies that are highly interdependent or highly interrelated to the technologies provided at the inception of the agreement ( “ dynamic fixed-fee agreements ” ) and ( ii ) those agreements that do not provide for rights to such future technologies ( “ static fixed-fee agreements ” ) . as a result of our adoption of the new guidance , we will continue to recognize revenue from dynamic fixed-fee agreements on a straight-line basis over the term of the related license agreement , while we expect to recognize most or all of the revenue from static fixed-fee agreements in the quarter the license agreement is signed . we will not recognize any ongoing revenue from static fixed-fee agreements already in existence at the time the guidance was adopted . additionally , in the event a significant financing component is determined to exist in any of our agreements , we will recognize more or less revenue and corresponding interest expense or income , as appropriate . in addition , under our previous accounting practices , we recognized revenue from our per-unit license agreements in the period in which we received the related royalty report , generally one quarter in arrears from the period in which the underlying sales occurred ( i.e . on a `` quarter-lag `` ) . we are now required to record per-unit royalty revenue in the same period in which the licensee 's underlying sales occur . because we generally do not receive the per-unit licensee royalty reports for sales during a given quarter within the time frame necessary to adequately review the reports and include the actual amounts in our quarterly results for such quarter , we accrue the related revenue based on estimates of our licensees ' underlying sales , subject to certain constraints on our ability to estimate such amounts . as a result of accruing revenue for the quarter based on such estimates , adjustments will be required in the following quarter to true-up revenue to the actual amounts reported by our licensees . in addition , to the extent we receive non-refundable prepayments related to per-unit license agreements that do not provide rights over the term of the license to future technologies that are highly interdependent or highly interrelated to the technologies provided at the inception of the agreement , we will recognize such prepayments as revenue in the period in which all remaining revenue recognition criteria have been met . in 2018 , 2017 , and 2016 , our total revenues were $ 307.4 million , $ 532.9 million and $ 665.9 million , respectively . story_separator_special_tag we use a time-based input method of progress to determine the timing of revenue recognition , and as such we recognize the future deliverables on a straight-line basis over the term of the agreement . we utilize the straight-line method as we believe that it best depicts efforts expended to develop and transfer updates to the customer evenly throughout the term of the agreement . static fixed-fee license agreements are fixed-price contracts that generally do not include updates to technology we create after the inception of the license agreement or in which the customer does not stand to substantively benefit from those updates during the term . generally , our performance obligations are satisfied at contract signing , and as such revenue is recognized at that time . variable agreements upon entering a new variable patent license agreement , the licensee typically agrees to pay royalties or license fees on licensed products sold during the term of the agreement . we utilize the sales- or usage- based royalty exception for these agreements and recognize revenues during the contract term when the underlying sale or usage occurs . our licensees under variable agreements provide us with quarterly royalty reports that summarize their sales of covered products and their related royalty obligations to us . we typically receive these royalty reports subsequent to the period in which our licensees ' underlying sales occurred . as a result , we are required to estimate revenues , subject to the constraint on our ability to estimate such amounts . technology solutions technology solutions revenue consists primarily of revenue from royalty payments . we recognize revenue from royalty payments using the same methods described above under our policy for recognizing revenue from patent license agreements . technology solutions revenues also consist of revenues from software licenses , engineering services and product sales . the nature of these contracts and timing of payments vary . patent sales our business strategy of monetizing our intellectual property includes the sale of select patent assets . as patent sales executed under this strategy represent a component of our ongoing major or central operations and activities , we will record the related proceeds as revenue . we will recognize the revenue in accordance with the five-step model , generally upon closing of the patent sale transaction . agreements with multiple performance obligations during 2018 , we signed four new agreements that had multiple performance obligations . consistent with the revenue recognition policies disclosed above under asc 606 , we ( 1 ) identified the contract with the customer , ( 2 ) identified the performance obligations , ( 3 ) determined the transaction price , ( 4 ) allocated the transaction price to the performance obligations , and ( 5 ) recognized revenue as we satisfy the performance obligations . we allocated the transaction price to each performance obligation for accounting purposes using our best estimate of the term and value . the development of a number of these inputs and assumptions in the models requires a significant amount of management judgment and is based upon a number of factors , including the assumed royalty rates , projected sales volumes , discount rate , comparable market transactions which are not directly observable and other relevant factors . changes in any of a number of these assumptions could have had a substantial impact on the relative fair value assigned to each performance obligation for accounting purposes . these inputs and assumptions represent management 's best estimates at the time of the transaction . the impact that a five percent change in the aggregate amount allocated to past patent royalties under these agreements would have had on 2018 revenue is summarized in the following table ( in thousands ) : change in amount allocated allocation to past patent royalties +5 % - % 5 change in revenue $ 2,324 $ ( 2,324 ) revenue from non-financial sources during 2018 , 2017 and 2016 , our patent licensing royalties were derived from patent license agreements ( `` plas `` ) with 66 , 27 and 26 independent licensees , respectively . the number of independent licensees largely increased from 2017 to 2018 due to the technicolor acquisition . we recognized revenue from three , five and four plas in 2018 , 2017 and 2016 , 44 respectively , for which patents generally comprised less than one-third of the total consideration paid or due to us under those agreements . in addition , during 2018 , 2017 and 2016 , we recognized revenue from one pla that was executed in 2014 in connection with a patent purchase agreement ( `` ppa `` ) with the licensee . total cash paid to our licensee under this ppa is approximately 56 % of the total cash due to us under this licensee 's pla . during 2018 , 2017 and 2016 , approximately 3 % , 4 % and 3 % , respectively , of our total revenue was based on the estimated fair value of the patents in the above transactions . we estimated the fair value of the patents in the above transactions primarily by a combination of a discounted cash flow analysis ( the income approach ) , an analysis of comparable market transactions ( the market approach ) , and or by quantifying the amount of money required to replace the future service capability of the assets ( the cost approach ) . for the income approach , the inputs and assumptions used to develop these estimates were based on a market participant perspective and included estimates of projected royalties , discount rates , economic lives and income tax rates , among others . for the market approach , judgment was applied as to which market transactions were most comparable to this transaction . for the cost approach , we utilized the historical cost of assets of similar technologies to determine the estimated replacement cost , including research , development , testing

cash flows provided by operating activities $ 146,792 $ 315,800 $ ( 169,008 ) our cash flows provided by operating activities are principally derived from cash receipts from patent license and technology solutions agreements offset by cash operating expenses and income tax payments . the decrease in cash flows provided by operating activities of $ 169.0 million was primarily attributable to a decrease in cash receipts of $ 183.7 million . this decrease in cash receipts was primarily attributable to the fixed-fee payment structures for existing licensees , as well as the final cash receipts in 2017 for certain fixed-fee agreements that expired in 2018. the table below provides the significant items comprising our cash flows provided by operating activities during the years ended december 31 , 2018 and 2017 ( in thousands ) . replace_table_token_9_th ( a ) cash operating expenses include operating expenses less depreciation of fixed assets , amortization of patents , non-cash compensation and non-cash changes in fair value . 48 ( b ) income taxes paid include foreign withholding taxes . for the year ended december 31 , 2018 , this amount includes a net cash benefit of $ 17.5 million related to the competent authority proceeding discussed further above and within note 14 , `` income taxes , '' in the consolidated financial statements . working capital we believe that working capital , adjusted to exclude cash , cash equivalents , restricted cash and short-term investments and to include current deferred revenue provides additional information about non-cash assets and liabilities that might affect our near-term liquidity . while we believe cash and short-term investments are important measures of our liquidity , the remaining components of our current assets and current liabilities , with the exception of deferred revenue , could affect our near-term liquidity and or cash flow . we have no material obligations associated with our deferred revenue , and the amortization of deferred revenue has no impact on our future liquidity and or cash flow .


 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 provided by operating activities $ 146,792 $ 315,800 $ ( 169,008 ) our cash flows provided by operating activities are principally derived from cash receipts from patent license and technology solutions agreements offset by cash operating expenses and income tax payments . the decrease in cash flows provided by operating activities of $ 169.0 million was primarily attributable to a decrease in cash receipts of $ 183.7 million . this decrease in cash receipts was primarily attributable to the fixed-fee payment structures for existing licensees , as well as the final cash receipts in 2017 for certain fixed-fee agreements that expired in 2018. the table below provides the significant items comprising our cash flows provided by operating activities during the years ended december 31 , 2018 and 2017 ( in thousands ) . replace_table_token_9_th ( a ) cash operating expenses include operating expenses less depreciation of fixed assets , amortization of patents , non-cash compensation and non-cash changes in fair value . 48 ( b ) income taxes paid include foreign withholding taxes . for the year ended december 31 , 2018 , this amount includes a net cash benefit of $ 17.5 million related to the competent authority proceeding discussed further above and within note 14 , `` income taxes , '' in the consolidated financial statements . working capital we believe that working capital , adjusted to exclude cash , cash equivalents , restricted cash and short-term investments and to include current deferred revenue provides additional information about non-cash assets and liabilities that might affect our near-term liquidity . while we believe cash and short-term investments are important measures of our liquidity , the remaining components of our current assets and current liabilities , with the exception of deferred revenue , could affect our near-term liquidity and or cash flow . we have no material obligations associated with our deferred revenue , and the amortization of deferred revenue has no impact on our future liquidity and or cash flow .
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 Suspicious Activity Report : products incorporating our patented inventions in video include cellular phones , tablets , notebook computers , computers , televisions , gaming consoles , set-top boxes , streaming devices and other consumer electronics . interdigital derives revenues primarily from patent licensing , with smaller contributions from patent sales , product sales , technology solutions licensing and sales and engineering services . on january 1 , 2018 , we adopted the requirements of asu no . 2014-09 , `` revenue from contracts with customers ( topic 606 ) `` ( `` asc 606 `` ) using the modified retrospective method . refer to the `` revenue `` section below as well as note 3 , `` revenue recognition , `` within the consolidated financial statements for further information regarding our adoption of asc 606. acquisition of technicolor 's patent licensing business on july 30 , 2018 , we completed the technicolor acquisition . the final transaction includes the acquisition by interdigital of approximately 18,000 patents and applications , across a broad range of technologies , including approximately 3,000 worldwide video coding patents and applications . refer to note 5 , “ business combinations , ” within the consolidated financial statements for more information on this transaction . acquisition of technicolor 's research & innovation unit on february 11 , 2019 , we announced that we had made a binding offer to acquire the research & innovation ( `` r & i `` ) unit of technicolor sa . r & i is a premier research lab that conducts fundamental research into video coding , iot and smart home , imaging sciences , ar and vr and artificial intelligence and machine learning technologies . after completing the required prior consultation with technicolor 's works council , the companies expect to execute a definitive acquisition agreement , the terms of which have been negotiated . the transaction is expected to close in mid-2019 , subject to customary closing conditions . as consideration for the acquisition , the parties have agreed to terminate the jointly-funded r & d collaboration that was entered into as part of the technicolor acquisition . in addition , technicolor has agreed to reduce its rights to a revenue-sharing arrangement announced as part of the technicolor acquisition . there is no cash consideration . 39 revenue as discussed above , we adopted new revenue guidance , asc 606 , effective january 1 , 2018 using the modified retrospective method . this resulted in a cumulative adjustment of $ 161.3 million to retained earnings . consistent with the modified retrospective adoption method , our results of operations for periods prior to our adoption of asc 606 remain unchanged . as such , revenue is presented in accordance with asc 606 for the year ended december 31 , 2018 and in accordance with asc 605 for all prior periods presented . refer to note 3 , “ revenue recognition , ” within the consolidated financial statements for further information regarding our adoption of asc 606. the adoption of the new guidance affected our recognition of revenue from both our fixed-fee and per-unit license agreements . for accounting purposes under this new guidance , we separate our fixed-fee license agreements into two categories : ( i ) those agreements that provide rights , over the term of the license , to future technologies that are highly interdependent or highly interrelated to the technologies provided at the inception of the agreement ( “ dynamic fixed-fee agreements ” ) and ( ii ) those agreements that do not provide for rights to such future technologies ( “ static fixed-fee agreements ” ) . as a result of our adoption of the new guidance , we will continue to recognize revenue from dynamic fixed-fee agreements on a straight-line basis over the term of the related license agreement , while we expect to recognize most or all of the revenue from static fixed-fee agreements in the quarter the license agreement is signed . we will not recognize any ongoing revenue from static fixed-fee agreements already in existence at the time the guidance was adopted . additionally , in the event a significant financing component is determined to exist in any of our agreements , we will recognize more or less revenue and corresponding interest expense or income , as appropriate . in addition , under our previous accounting practices , we recognized revenue from our per-unit license agreements in the period in which we received the related royalty report , generally one quarter in arrears from the period in which the underlying sales occurred ( i.e . on a `` quarter-lag `` ) . we are now required to record per-unit royalty revenue in the same period in which the licensee 's underlying sales occur . because we generally do not receive the per-unit licensee royalty reports for sales during a given quarter within the time frame necessary to adequately review the reports and include the actual amounts in our quarterly results for such quarter , we accrue the related revenue based on estimates of our licensees ' underlying sales , subject to certain constraints on our ability to estimate such amounts . as a result of accruing revenue for the quarter based on such estimates , adjustments will be required in the following quarter to true-up revenue to the actual amounts reported by our licensees . in addition , to the extent we receive non-refundable prepayments related to per-unit license agreements that do not provide rights over the term of the license to future technologies that are highly interdependent or highly interrelated to the technologies provided at the inception of the agreement , we will recognize such prepayments as revenue in the period in which all remaining revenue recognition criteria have been met . in 2018 , 2017 , and 2016 , our total revenues were $ 307.4 million , $ 532.9 million and $ 665.9 million , respectively . story_separator_special_tag we use a time-based input method of progress to determine the timing of revenue recognition , and as such we recognize the future deliverables on a straight-line basis over the term of the agreement . we utilize the straight-line method as we believe that it best depicts efforts expended to develop and transfer updates to the customer evenly throughout the term of the agreement . static fixed-fee license agreements are fixed-price contracts that generally do not include updates to technology we create after the inception of the license agreement or in which the customer does not stand to substantively benefit from those updates during the term . generally , our performance obligations are satisfied at contract signing , and as such revenue is recognized at that time . variable agreements upon entering a new variable patent license agreement , the licensee typically agrees to pay royalties or license fees on licensed products sold during the term of the agreement . we utilize the sales- or usage- based royalty exception for these agreements and recognize revenues during the contract term when the underlying sale or usage occurs . our licensees under variable agreements provide us with quarterly royalty reports that summarize their sales of covered products and their related royalty obligations to us . we typically receive these royalty reports subsequent to the period in which our licensees ' underlying sales occurred . as a result , we are required to estimate revenues , subject to the constraint on our ability to estimate such amounts . technology solutions technology solutions revenue consists primarily of revenue from royalty payments . we recognize revenue from royalty payments using the same methods described above under our policy for recognizing revenue from patent license agreements . technology solutions revenues also consist of revenues from software licenses , engineering services and product sales . the nature of these contracts and timing of payments vary . patent sales our business strategy of monetizing our intellectual property includes the sale of select patent assets . as patent sales executed under this strategy represent a component of our ongoing major or central operations and activities , we will record the related proceeds as revenue . we will recognize the revenue in accordance with the five-step model , generally upon closing of the patent sale transaction . agreements with multiple performance obligations during 2018 , we signed four new agreements that had multiple performance obligations . consistent with the revenue recognition policies disclosed above under asc 606 , we ( 1 ) identified the contract with the customer , ( 2 ) identified the performance obligations , ( 3 ) determined the transaction price , ( 4 ) allocated the transaction price to the performance obligations , and ( 5 ) recognized revenue as we satisfy the performance obligations . we allocated the transaction price to each performance obligation for accounting purposes using our best estimate of the term and value . the development of a number of these inputs and assumptions in the models requires a significant amount of management judgment and is based upon a number of factors , including the assumed royalty rates , projected sales volumes , discount rate , comparable market transactions which are not directly observable and other relevant factors . changes in any of a number of these assumptions could have had a substantial impact on the relative fair value assigned to each performance obligation for accounting purposes . these inputs and assumptions represent management 's best estimates at the time of the transaction . the impact that a five percent change in the aggregate amount allocated to past patent royalties under these agreements would have had on 2018 revenue is summarized in the following table ( in thousands ) : change in amount allocated allocation to past patent royalties +5 % - % 5 change in revenue $ 2,324 $ ( 2,324 ) revenue from non-financial sources during 2018 , 2017 and 2016 , our patent licensing royalties were derived from patent license agreements ( `` plas `` ) with 66 , 27 and 26 independent licensees , respectively . the number of independent licensees largely increased from 2017 to 2018 due to the technicolor acquisition . we recognized revenue from three , five and four plas in 2018 , 2017 and 2016 , 44 respectively , for which patents generally comprised less than one-third of the total consideration paid or due to us under those agreements . in addition , during 2018 , 2017 and 2016 , we recognized revenue from one pla that was executed in 2014 in connection with a patent purchase agreement ( `` ppa `` ) with the licensee . total cash paid to our licensee under this ppa is approximately 56 % of the total cash due to us under this licensee 's pla . during 2018 , 2017 and 2016 , approximately 3 % , 4 % and 3 % , respectively , of our total revenue was based on the estimated fair value of the patents in the above transactions . we estimated the fair value of the patents in the above transactions primarily by a combination of a discounted cash flow analysis ( the income approach ) , an analysis of comparable market transactions ( the market approach ) , and or by quantifying the amount of money required to replace the future service capability of the assets ( the cost approach ) . for the income approach , the inputs and assumptions used to develop these estimates were based on a market participant perspective and included estimates of projected royalties , discount rates , economic lives and income tax rates , among others . for the market approach , judgment was applied as to which market transactions were most comparable to this transaction . for the cost approach , we utilized the historical cost of assets of similar technologies to determine the estimated replacement cost , including research , development , testing

