Collaboration and License Agreements	12 Months Ended
Dec. 31, 2020
Collaboration and License Agreements [Abstract]
Collaboration and License Agreements	Collaboration and License Agreements Lexicon has derived substantially all of its revenues from drug discovery and development alliances, target validation collaborations for the development and, in some cases, analysis of the physiological effects of genes altered in knockout mice, product sales, government grants and contracts, technology licenses, subscriptions to its databases and compound library sales. Ipsen. In October 2014, Lexicon entered into a License and Collaboration Agreement, which was subsequently amended in March 2015 (collectively, the “Ipsen Agreement”), with Ipsen for the development and commercialization of XERMELO outside of the United States and Japan (the “Licensed Territory”). The Ipsen Agreement was assigned to TerSera in September 2020 in connection with the XERMELO sale. Under the Ipsen Agreement, Lexicon granted Ipsen an exclusive, royalty-bearing right and license under its patent rights and know-how to commercialize XERMELO in the Licensed Territory. Ipsen is responsible for using diligent efforts to commercialize XERMELO in the Licensed Territory pursuant to a mutually approved commercialization plan. Subject to certain exceptions, Lexicon was responsible for conducting clinical trials required to obtain regulatory approval for XERMELO for carcinoid syndrome in the European Union, including those contemplated by a mutually approved initial development plan, and had the first right to conduct most other clinical trials of XERMELO. Lexicon was responsible for the costs of all clinical trials contemplated by the initial development plan. The costs of additional clinical trials were to be allocated between the parties based on the nature of such clinical trials. Under the Ipsen Agreement, Ipsen paid Lexicon an aggregate of $47.2 million through September 30, 2020, consisting of $24.5 million in upfront payments, a $6.4 million milestone upon the acceptance of the filing submitted by Ipsen to the European Medicines Agency for XERMELO as an adjunct to somatostatin analog therapy for the long-term treatment of carcinoid syndrome, a $5.1 million milestone upon Ipsen’s receipt of approval from the European Commission for the marketing of XERMELO in all member states of the European Union, Norway and Iceland, a $3.8 million milestone upon Ipsen’s first commercial sale in Germany, a $3.8 million milestone upon Ipsen’s first commercial sale in the United Kingdom, a $1.3 million milestone upon Ipsen’s receipt of approval from Health Canada and a $2.3 million milestone upon Ipsen's first commercial sale in Canada. In addition, Lexicon was eligible to receive from Ipsen (a) up to an aggregate of approximately $9.6 million upon the achievement of specified regulatory and commercial launch milestones and (b) up to an aggregate of €72 million upon the achievement of specified sales milestones. Milestone payments that were contingent upon achievement of a substantive milestone were deemed constrained. Lexicon was also entitled to tiered, escalating royalties ranging from low twenties to mid-thirties percentages of net sales of XERMELO in the Licensed Territory, subject to a credit for amounts previously paid to Lexicon by Ipsen for the manufacture and supply of such units of XERMELO. Lexicon and Ipsen had entered into a commercial supply agreement pursuant to which Lexicon supplied Ipsen’s commercial requirements of XERMELO, and Ipsen paid an agreed upon transfer price for such commercial supply. The Company considered the following as its performance obligations with respect to the revenue recognition of the $24.5 million upfront payment: •The exclusive license granted to Ipsen to develop and commercialize XERMELO in the Licensed Territory; •The development services Lexicon is performing for XERMELO; •The obligation to participate in committees which govern the development of XERMELO until commercialization; and •The obligation to supply commercial supply of XERMELO, under a commercial supply agreement. The Company determined that the license had stand-alone value because it is an exclusive license that grants Ipsen the right to develop and commercialize XERMELO or to sublicense its rights. In addition, at the time of the agreement, it would have been possible for Ipsen or another third party to conduct clinical trials without assistance from Lexicon. As a result, the Company considered the license and the development services under the Agreement to be separate performance obligations. The Company recognized the portion of the transaction price allocated to the license immediately because Lexicon delivered the license and earned the revenue at the inception of the arrangement. The Company recognized as revenue the amount allocated to the development services and the obligation to participate in committees over the period of time Lexicon performed services, which was completed in 2018. The Company determined that the commercial supply agreement was a contingent deliverable at the onset. There was inherent uncertainty in obtaining regulatory approval at the time and entry into the commercial supply agreement, thus making the applicability of the commercial supply agreement outside the control of Lexicon and Ipsen. As a result, the Company determined the commercial supply agreement did not meet the definition of a performance obligation that needed to be accounted for at the inception of the arrangement. The Company also determined that there was no significant and incremental discount related to the commercial supply agreement that should have been accounted for at the inception of the arrangement. The Company determined that the initial transaction price was the $24.5 million upfront payments because they were the only payments that were fixed and determinable at the inception of the arrangement. There was considerable uncertainty at the date of the agreement as to whether Lexicon would earn milestone payments, royalty payments or payments for finished drug product. As such, the Company did not include those payments in the transaction price. The Company allocated the transaction price based on the relative best estimate of selling price of each performance obligation. The Company estimated the selling price of the license deliverable by applying a probability-based income approach utilizing an appropriate discount rate. The significant inputs the Company used to determine the projected income of the license included: estimated future product sales, estimated cost of goods sold, estimated operating expenses, income taxes, and an appropriate discount rate. The Company estimated the selling price of the development services by using internal estimates of the cost to hire third parties to perform the services over the expected period to perform the development. The Company estimated the selling price of the obligation to participate in committees by using internal estimates of the number of internal hours and salary and benefits costs to perform these services. As a result of the allocation, the Company recognized $21.2 million of the $24.5 million upfront payment for the license in 2014, and an additional $1.4 million in 2015 upon entering into the amendment. The Company recognized the $1.7 million allocated to the development services deliverable over the estimated period of performance as development occurred, and recognized the $0.1 million allocated to the committee participation deliverable ratably over the period of performance. Milestone payments that were contingent upon the achievement of a substantive milestone were deemed constrained. If or when the constraint was determined to be resolved, the Company re-evaluated the overall transaction price and recognized an adjustment on a cumulative catch-up basis in the period that the adjustment was evaluated. Revenue recognized under the Agreement was $0.3 million, $4.9 million and $4.6 million for the years ended December 31, 2020, 2019 and 2018, respectively. Revenue for each of the years ended December 31, 2020, 2019 and 2018 include $0.3 million of royalties from Ipsen. Revenue for the years ended December 31, 2020, 2019 and 2018 include zero, $1.3 million and $1.6 million, respectively, from sales of bulk tablets of XERMELO to Ipsen. Sanofi. In November 2015, Lexicon entered into a Collaboration and License Agreement, which was subsequently amended in July 2017 (collectively, the “Sanofi Agreement”), with Sanofi for the worldwide development and commercialization of Lexicon’s diabetes drug candidate sotagliflozin. In December 2016, Sanofi terminated its rights under the Sanofi Agreement with respect to Japan. Effective as of September 9, 2019 (the “Settlement Date”), Lexicon entered into a Termination and Settlement Agreement and Mutual Releases (the “Termination Agreement”) with Sanofi, pursuant to which the Sanofi Agreement was terminated and associated disputes between Lexicon and Sanofi were settled. Under the terms of the Termination Agreement, Lexicon regained all rights to sotagliflozin and assumed full responsibility for the worldwide development and commercialization of sotagliflozin in all indications. Sanofi paid Lexicon $208 million in September 2019, $26 million in each of March and September 2020 (less amounts withheld by Sanofi offsetting certain third party costs and internal costs incurred by Sanofi and asserted by Sanofi to be payable by Lexicon under the terms of the Termination Agreement), and neither party will owe additional payments pursuant to the Sanofi Agreement. The parties have cooperated in the transition of responsibility for ongoing clinical studies and other activities, and each party is responsible for its own expenses associated with such transition, subject to certain exceptions. See Note 11, Commitments and Contingencies, for additional information. Beginning in March 2020, Lexicon closed out early the clinical studies related to the Phase 3 development program for sotagliflozin in type 2 diabetes, heart failure and chronic kidney disease. Under the Sanofi Agreement, Lexicon had granted Sanofi an exclusive, worldwide (excluding Japan), royalty-bearing right and license under its patent rights and know-how to develop, manufacture and commercialize sotagliflozin. Subject to specified exceptions, neither party could (a) perform clinical development activities relating to any other compound which inhibits sodium-glucose cotransporters type 1 or type 2 or (b) commercialize any such compounds in the United States, countries of the European Union and certain other specified countries, in each case during the royalty terms applicable in such countries. Among the specified exceptions was a right Lexicon retained to pursue the development of its development candidate LX2761, with respect to which Lexicon granted Sanofi certain rights of first negotiation specified in the Sanofi Agreement. Under the Sanofi Agreement, Sanofi paid Lexicon an upfront payment of $300 million. In addition, Lexicon was eligible to receive from Sanofi (a) up to an aggregate of $110 million upon the achievement of four development milestones relating to the results of certain Phase 3 clinical trials of sotagliflozin in type 2 diabetes patients, (b) up to an aggregate of $220 million upon the achievement of four regulatory milestones relating to the first commercial sale following regulatory approval of sotagliflozin for type 1 and type 2 diabetes, respectively, in each of the United States and Europe, of which two milestones representing the substantial majority of such aggregate amount relate to type 2 diabetes and the remaining two milestones relate to type 1 diabetes, (c) $100 million upon the achievement of a milestone based on the results of either of two outcomes studies in type 2 diabetes patients, the completion of which would likely occur after initial regulatory approval of sotagliflozin in type 2 diabetes, and (d) up to an aggregate of $990 million upon the achievement of six commercial milestones that would be achieved upon reaching specified levels of sales. The Company believed that each of the development and regulatory milestones under the Sanofi Agreement was substantive. Due to the uncertainty surrounding the achievement of the future development and regulatory milestones, these payments were deemed constrained and were not recognized as revenue. Commercial milestones would have been accounted for as royalties and recorded as revenue upon achievement of the milestone, assuming all other revenue recognition criteria were met. Lexicon was also entitled to tiered, escalating royalties ranging from low double digit percentages to forty percent of net sales of sotagliflozin, based on indication and territory, with royalties for the higher band of such range attributable to net sales for type 1 diabetes in the United States, and subject in each case to customary royalty reduction provisions. Lexicon continued to be responsible for all clinical development activities relating to type 1 diabetes and exercised an exclusive option to co-promote and have a significant role, in collaboration with Sanofi, in the commercialization of sotagliflozin for the treatment of type 1 diabetes in the United States. Under the terms of its co-promotion option, Lexicon would have funded forty percent of the commercialization costs relating to such co-promotion activities. Sanofi was responsible for all clinical development and commercialization of sotagliflozin for the treatment of type 2 diabetes worldwide and would have been solely responsible for the commercialization of sotagliflozin for the treatment of type 1 diabetes outside the United States. Lexicon shared in the funding of a portion of the planned type 2 diabetes development costs over the first three years of the collaboration, up to an aggregate of $100 million, which was satisfied in 2018. Sanofi would have booked sales worldwide in all indications. The parties were responsible for using commercially reasonable efforts to perform their development and commercialization obligations pursuant to mutually approved development and commercialization plans. The parties’ activities under the Sanofi Agreement were governed by a joint steering committee and certain other governance committees which reflected equal or other appropriate representation from both parties. If the applicable governance committee was not able to make a decision by consensus and the parties were not able to resolve the issue through escalation to specified senior executive officers of the parties, then Sanofi would have final decision-making authority, subject to limitations specified in the Sanofi Agreement. The Sanofi Agreement would have expired upon the expiration of all applicable royalty terms for all licensed products in all countries. The royalty term for each licensed product in each country was the period commencing on the effective date of the Sanofi Agreement and ending on the latest of expiration of specified patent coverage, expiration of specified regulatory exclusivity and 10 years following the first commercial sale in the applicable country. Either party had the right to terminate the Sanofi Agreement in the event of an uncured material breach by the other party. Prior to completion of the core development activities for type 2 diabetes specified in the development plan, Sanofi had the right to terminate the Sanofi Agreement on a country-by-country and licensed product-by-licensed product basis, in the event of (a) notification of a material safety issue relating to the licensed product or the class of sodium-glucose cotransporters type 1 or type 2 inhibitors resulting in a recommendation or requirement that Lexicon or Sanofi cease development, (b) failure to achieve positive results with respect to certain clinical trial results, (c) the occurrence of specified fundamental adverse events or (d) the exploitation of the licensed product infringing third party intellectual property rights in specified major markets and Sanofi is unable to obtain a license to such third party intellectual property rights. The Company considered the following as its performance obligations with respect to the revenue recognition of the $300 million upfront payment: •The exclusive worldwide license granted to Sanofi to develop and commercialize sotagliflozin; •The development services Lexicon was to perform for sotagliflozin relating to type 1 diabetes; and •The funding Lexicon was to provide for development relating to type 2 diabetes. The Company determined that the license had stand-alone value because it was an exclusive license that gave Sanofi the right to develop and commercialize sotagliflozin or to sublicense its rights. In addition, sotagliflozin was then in development and it was possible that Sanofi or another third party could conduct clinical trials without assistance from Lexicon. As a result, the Company considered the license and the development services under the Sanofi Agreement to be separate performance obligations. The Company recognized the portion of the transaction price allocated to the license immediately because Lexicon delivered the license and earned the revenue at the inception of the arrangement. The Company was recognizing as revenue the amount allocated to the development services for type 1 diabetes over the period of time Lexicon performed services, which was expected to be through 2027, and recognized as revenue the obligation to provide funding for development services for type 2 diabetes over the period of time Lexicon provided the funding, which was completed in 2018. The Company determined that the initial transaction price was the $300 million upfront payment because it was the only payment that was fixed and determinable at the inception of the arrangement. There was considerable uncertainty at the date of the agreement as to whether Lexicon would earn milestone payments or royalty payments. As such, the Company did not include those payments in the allocable consideration. The Company allocated the transaction price based on the relative best estimate of selling price of each performance obligation. The Company estimated the selling price of the license deliverable by applying a probability-based income approach utilizing an appropriate discount rate. The significant inputs the Company used to determine the projected income of the license included: exercising the option to co-promote, estimated future product sales, estimated cost of goods sold, estimated operating expenses, income taxes, and an appropriate discount rate. The Company estimated the selling price of the development services for type 1 diabetes by using internal estimates of the cost to hire third parties to perform the services over the expected period to perform the development. The Company estimated the obligation to provide funding for type 2 diabetes by using internal estimates of the expected cash flows and timing for $100 million in funding.As a result of the allocation of the Sanofi Agreement, the Company recognized $126.8 million of the $300 million upfront payment for the license in 2015. The Company was recognizing the $113.8 million allocated to the development services performance obligation and the $59.4 million allocated to the funding performance obligation over the estimated period of performance as the development and funding occurred. The Termination Agreement was accounted for as a modification under ASC 606. Upon execution of the Termination Agreement in September 2019, the Company recognized the remaining $23.5 million allocated to Lexicon’s performance obligations as revenue and reduced its remaining deferred revenue balance accordingly. In addition, the Company recognized revenue of $260 million, representing the full cash consideration from the Termination Agreement. Subsequent to the Termination Agreement, the Company has no remaining performance obligations to Sanofi. Revenue recognized under the collaboration agreements with Sanofi was $286 million and $33.2 million for the years ended December 31, 2019 and 2018, respectively.

Under the Ipsen Agreement, Lexicon granted Ipsen an exclusive, royalty-bearing right and license under its patent rights and know-how to commercialize XERMELO in the Licensed Territory. Ipsen is responsible for using diligent efforts to commercialize XERMELO in the Licensed Territory pursuant to a mutually approved commercialization plan. Subject to certain exceptions, Lexicon was responsible for conducting clinical trials required to obtain regulatory approval for XERMELO

for carcinoid syndrome in the European Union, including those contemplated by a mutually approved initial development plan, and had the first right to conduct most other clinical trials of XERMELO. Lexicon was responsible for the costs of all clinical trials contemplated by the initial development plan. The costs of additional clinical trials were to be allocated between the parties based on the nature of such clinical trials. Under the Ipsen Agreement, Ipsen paid Lexicon an aggregate of $47.2 million through September 30, 2020, consisting of $24.5 million in upfront payments, a $6.4 million milestone upon the acceptance of the filing submitted by Ipsen to the European Medicines Agency for XERMELO as an adjunct to somatostatin analog therapy for the long-term treatment of carcinoid syndrome, a $5.1 million milestone upon Ipsen’s receipt of approval from the European Commission for the marketing of XERMELO in all member states of the European Union, Norway and Iceland, a $3.8 million milestone upon Ipsen’s first commercial sale in Germany, a $3.8 million milestone upon Ipsen’s first commercial sale in the United Kingdom, a $1.3 million milestone upon Ipsen’s receipt of approval from Health Canada and a $2.3 million milestone upon Ipsen's first commercial sale in Canada. In addition, Lexicon was eligible to receive from Ipsen (a) up to an aggregate of approximately $9.6 million upon the achievement of specified regulatory and commercial launch milestones and (b) up to an aggregate of €72 million upon the achievement of specified sales milestones. Milestone payments that were contingent upon achievement of a substantive milestone were deemed constrained. Lexicon was also entitled to tiered, escalating royalties ranging from low twenties to mid-thirties percentages of net sales of XERMELO in the Licensed Territory, subject to a credit for amounts previously paid to Lexicon by Ipsen for the manufacture and supply of such units of XERMELO. Lexicon and Ipsen had entered into a commercial supply agreement pursuant to which Lexicon supplied Ipsen’s commercial requirements of XERMELO, and Ipsen paid an agreed upon transfer price for such commercial supply.

The Company determined that the license had stand-alone value because it is an exclusive license that grants Ipsen the right to develop and commercialize XERMELO or to sublicense its rights. In addition, at the time of the agreement, it would have been possible for Ipsen or another third party to conduct clinical trials without assistance from Lexicon. As a result, the Company considered the license and the development services under the Agreement to be separate performance obligations. The Company recognized the portion of the transaction price allocated to the license immediately because Lexicon delivered the license and earned the revenue at the inception of the arrangement. The Company recognized as revenue the amount allocated to the development services and the obligation to participate in committees over the period of time Lexicon performed services, which was completed in 2018.

The Company determined that the commercial supply agreement was a contingent deliverable at the onset. There was inherent uncertainty in obtaining regulatory approval at the time and entry into the commercial supply agreement, thus making the applicability of the commercial supply agreement outside the control of Lexicon and Ipsen. As a result, the Company determined the commercial supply agreement did not meet the definition of a performance obligation that needed to be accounted for at the inception of the arrangement. The Company also determined that there was no significant and incremental discount related to the commercial supply agreement that should have been accounted for at the inception of the arrangement.

The Company determined that the initial transaction price was the $24.5 million upfront payments because they were the only payments that were fixed and determinable at the inception of the arrangement. There was considerable uncertainty at the date of the agreement as to whether Lexicon would earn milestone payments, royalty payments or payments for finished drug product. As such, the Company did not include those payments in the transaction price. The Company allocated the transaction price based on the relative best estimate of selling price of each performance obligation. The Company estimated the selling price of the license deliverable by applying a probability-based income approach utilizing an appropriate discount rate. The significant inputs the Company used to determine the projected income of the license included: estimated future product sales, estimated cost of goods sold, estimated operating expenses, income taxes, and an appropriate discount rate. The Company estimated the selling price of the development services by using internal estimates of the cost to hire third parties to perform the services over the expected period to perform the development. The Company estimated the selling price of the obligation to participate in committees by using internal estimates of the number of internal hours and salary and benefits costs to perform these services.

As a result of the allocation, the Company recognized $21.2 million of the $24.5 million upfront payment for the license in 2014, and an additional $1.4 million in 2015 upon entering into the amendment. The Company recognized the $1.7 million allocated to the development services deliverable over the estimated period of performance as development occurred, and recognized the $0.1 million allocated to the committee participation deliverable ratably over the period of performance. Milestone payments that were contingent upon the achievement of a substantive milestone were deemed constrained. If or when the constraint was determined to be resolved, the Company re-evaluated the overall transaction price and recognized an adjustment on a cumulative catch-up basis in the period that the adjustment was evaluated. Revenue recognized under the Agreement was $0.3 million, $4.9 million and $4.6 million for the years ended December 31, 2020, 2019 and 2018, respectively. Revenue for each of the years ended December 31, 2020, 2019 and 2018 include $0.3 million of royalties from Ipsen. Revenue for the years ended December 31, 2020, 2019 and 2018 include zero, $1.3 million and $1.6 million, respectively, from sales of bulk tablets of XERMELO to Ipsen.

Under the terms of the Termination Agreement, Lexicon regained all rights to sotagliflozin and assumed full responsibility for the worldwide development and commercialization of sotagliflozin in all indications. Sanofi paid Lexicon $208 million in September 2019, $26 million in each of March and September 2020 (less amounts withheld by Sanofi offsetting certain third party costs and internal costs incurred by Sanofi and asserted by Sanofi to be payable by Lexicon under the terms of the Termination Agreement), and neither party will owe additional payments pursuant to the Sanofi Agreement. The parties have cooperated in the transition of responsibility for ongoing clinical studies and other activities, and each party is responsible for its own expenses associated with such transition, subject to certain exceptions. See Note 11, Commitments and Contingencies, for additional information. Beginning in March 2020, Lexicon closed out early the clinical studies related to the Phase 3 development program for sotagliflozin in type 2 diabetes, heart failure and chronic kidney disease.

Under the Sanofi Agreement, Lexicon had granted Sanofi an exclusive, worldwide (excluding Japan), royalty-bearing right and license under its patent rights and know-how to develop, manufacture and commercialize sotagliflozin. Subject to specified exceptions, neither party could (a) perform clinical development activities relating to any other compound which inhibits sodium-glucose cotransporters type 1 or type 2 or (b) commercialize any such compounds in the United States, countries of the European Union and certain other specified countries, in each case during the royalty terms applicable in such countries. Among the specified exceptions was a right Lexicon retained to pursue the development of its development candidate LX2761, with respect to which Lexicon granted Sanofi certain rights of first negotiation specified in the Sanofi Agreement.

Under the Sanofi Agreement, Sanofi paid Lexicon an upfront payment of $300 million. In addition, Lexicon was eligible to receive from Sanofi (a) up to an aggregate of $110 million upon the achievement of four development milestones relating to the results of certain Phase 3 clinical trials of sotagliflozin in type 2 diabetes patients, (b) up to an aggregate of $220 million upon the achievement of four regulatory milestones relating to the first commercial sale following regulatory approval of sotagliflozin for type 1 and type 2 diabetes, respectively, in each of the United States and Europe, of which two milestones representing the substantial majority of such aggregate amount relate to type 2 diabetes and the remaining two milestones relate to type 1 diabetes, (c) $100 million upon the achievement of a milestone based on the results of either of two outcomes studies in type 2 diabetes patients, the completion of which would likely occur after initial regulatory approval of sotagliflozin in type 2 diabetes, and (d) up to an aggregate of $990 million upon the achievement of six commercial milestones that would be achieved upon reaching specified levels of sales. The Company believed that each of the development and regulatory milestones under the Sanofi Agreement was substantive. Due to the uncertainty surrounding the achievement of the future development and regulatory milestones, these payments were deemed constrained and were not recognized as revenue. Commercial milestones would have been accounted for as royalties and recorded as revenue upon achievement of the milestone, assuming all other revenue recognition criteria were met. Lexicon was also entitled to tiered, escalating royalties ranging from low double digit percentages to forty percent of net sales of sotagliflozin, based on indication and territory, with royalties for the higher band of such range attributable to net sales for type 1 diabetes in the United States, and subject in each case to customary royalty reduction provisions.

Lexicon continued to be responsible for all clinical development activities relating to type 1 diabetes and exercised an exclusive option to co-promote and have a significant role, in collaboration with Sanofi, in the commercialization of sotagliflozin for the treatment of type 1 diabetes in the United States. Under the terms of its co-promotion option, Lexicon would have funded forty percent of the commercialization costs relating to such co-promotion activities. Sanofi was responsible for all clinical development and commercialization of sotagliflozin for the treatment of type 2 diabetes worldwide and would have been solely responsible for the commercialization of sotagliflozin for the treatment of type 1 diabetes outside the United States. Lexicon shared in the funding of a portion of the planned type 2 diabetes development costs over the first three years of the collaboration, up to an aggregate of $100 million, which was satisfied in 2018. Sanofi would have booked sales worldwide in all indications.

The parties’ activities under the Sanofi Agreement were governed by a joint steering committee and certain other governance committees which reflected equal or other appropriate representation from both parties. If the applicable governance committee was not able to make a decision by consensus and the parties were not able to resolve the issue through escalation to specified senior executive officers of the parties, then Sanofi would have final decision-making authority, subject to limitations specified in the Sanofi Agreement.

The Sanofi Agreement would have expired upon the expiration of all applicable royalty terms for all licensed products in all countries. The royalty term for each licensed product in each country was the period commencing on the effective date of the Sanofi Agreement and ending on the latest of expiration of specified patent coverage, expiration of specified regulatory exclusivity and 10 years following the first commercial sale in the applicable country. Either party had the right to terminate the Sanofi Agreement in the event of an uncured material breach by the other party. Prior to completion of the core development activities for type 2 diabetes specified in the development plan, Sanofi had the right to terminate the Sanofi Agreement on a country-by-country and licensed product-by-licensed product basis, in the event of (a) notification of a material safety issue relating to the licensed product or the class of sodium-glucose cotransporters type 1 or type 2 inhibitors resulting in a recommendation or requirement that Lexicon or Sanofi cease development, (b) failure to achieve positive results with respect to certain clinical trial results, (c) the occurrence of specified fundamental adverse events or (d) the exploitation of the licensed product infringing third party intellectual property rights in specified major markets and Sanofi is unable to obtain a license to such third party intellectual property rights.

The Company determined that the license had stand-alone value because it was an exclusive license that gave Sanofi the right to develop and commercialize sotagliflozin or to sublicense its rights. In addition, sotagliflozin was then in development and it was possible that Sanofi or another third party could conduct clinical trials without assistance from Lexicon. As a result, the Company considered the license and the development services under the Sanofi Agreement to be separate performance obligations. The Company recognized the portion of the transaction price allocated to the license immediately because Lexicon delivered the license and earned the revenue at the inception of the arrangement. The Company was recognizing as revenue the amount allocated to the development services for type 1 diabetes over the period of time Lexicon performed services, which was expected to be through 2027, and recognized as revenue the obligation to provide funding for development services for type 2 diabetes over the period of time Lexicon provided the funding, which was completed in 2018.

The Company determined that the initial transaction price was the $300 million upfront payment because it was the only payment that was fixed and determinable at the inception of the arrangement. There was considerable uncertainty at the date of the agreement as to whether Lexicon would earn milestone payments or royalty payments. As such, the Company did not include those payments in the allocable consideration. The Company allocated the transaction price based on the relative best estimate of selling price of each performance obligation. The Company estimated the selling price of the license deliverable by applying a probability-based income approach utilizing an appropriate discount rate. The significant inputs the Company used to determine the projected income of the license included: exercising the option to co-promote, estimated future product sales, estimated cost of goods sold, estimated operating expenses, income taxes, and an appropriate discount rate. The Company estimated the selling price of the development services for type 1 diabetes by using internal estimates of the cost to hire third parties to perform the services over the expected period to perform the development. The Company estimated the