Collaborative Agreements	3 Months Ended
Sep. 30, 2016
Agreements
Agreements	C. Agreements Significant Collaborative Agreements Roche In 2000, the Company granted Genentech, now a unit of Roche, an exclusive license to use the Company’s maytansinoid ADC technology with antibodies, such as trastuzumab, or other proteins that target HER2. Under the terms of this agreement, Roche has exclusive worldwide rights to develop and commercialize maytansinoid ADC compounds targeting HER2. In 2013, the HER2‑targeting ADC compound, Kadcyla, was approved for marketing in the U.S., Japan and the European Union, or EU. Roche has also received marketing approval in various other countries around the world. Roche is responsible for the manufacturing, product development and marketing of any products resulting from the agreement. The Company received a $2 million non‑refundable upfront payment from Roche upon execution of the agreement. The Company is also entitled to receive up to a total of $44 million in milestone payments, plus royalties on the commercial sales of Kadcyla or any other resulting products. Total milestones are categorized as follows: development milestones—$13.5 million; and regulatory milestones—$30.5 million. Through September 30, 2016, the Company has received and recognized $13.5 million and $20.5 million in development and regulatory milestone payments, respectively, related to Kadcyla. The next potential milestone the Company will be entitled to receive will be a $5 million regulatory milestone for marketing approval of Kadcyla for a first extended indication as defined in the agreement. Based on an evaluation of the effort contributed towards the achievement of this future milestone, the Company determined this milestone is not substantive. The Company receives royalty reports and payments related to sales of Kadcyla from Roche one quarter in arrears. In accordance with the Company’s revenue recognition policy, $6.2 million of non-cash royalties on net sales of Kadcyla for the three‑month period ended June 30, 2016 were recorded and included in non-cash royalty revenue for the three-month period ended September 30, 2016 and $5.7 million of non-cash royalties on net sales of Kadcyla for the three‑month period ended June 30, 2015 is included in non-cash royalty revenue for the three-month period ended September 30, 2015. Kadcyla sales occurring after January 1, 2015 are covered by a royalty purchase agreement whereby the associated cash is remitted to Immunity Royalty Holdings, L.P, or IRH, as discussed further in Note E. Amgen Under a now‑expired right‑to‑test agreement established in 2000, Amgen took three exclusive development and commercialization licenses, for which the Company received an exercise fee of $1 million for each license taken. In May 2013, Amgen took one non‑exclusive development and commercialization license, for which the Company received an exercise fee of $500,000. In October 2013, the non‑exclusive license was amended and converted to an exclusive license, for which Amgen paid an additional $500,000 fee to the Company. Amgen has sublicensed its rights under this license to Oxford BioTherapeutics Ltd. In December 2015, Amgen advised the Company that it had discontinued development of two product candidates, AMG 595 and AMG 172 that had been covered by two of Amgen’s four exclusive licenses, and in February 2016, Amgen terminated these two licenses. For each of the two remaining development and commercialization license taken, the Company is entitled to receive up to a total of $34 million in milestone payments, plus royalties on the commercial sales of any resulting products. The total milestones per license are categorized as follows: development milestones—$9 million; regulatory milestones—$20 million; and sales milestones—$5 million. Amgen (or its sublicensee(s)) is responsible for the manufacturing, product development and marketing of any products resulting from these development and commercialization licenses. Through September 30, 2016, the Company has received and recognized an aggregate of $3 million in milestone payments for compounds covered under this agreement now or in the past. In September 2015, Amgen’s IND application under the remaining license not sublicensed to Oxford BioTherapeutics became effective, triggering a $1 million milestone payment to the Company which is included in license and milestone fee revenue for the three month period ended September 30, 2015. The next potential milestone the Company will be entitled to receive under this license will be a development milestone for the first dosing of a patient in a Phase II clinical trial, which will result in a $3 million payment being due. The next potential milestone the Company will be entitled to receive under the May 2013 license will be a $1 million development milestone for an IND becoming effective. At the time of execution of each of these development and commercialization licenses, there was significant uncertainty as to whether these milestones would be achieved. In consideration of this, as well as the Company’s past involvement in the research and manufacturing of these product candidates, these milestones were deemed substantive. Lilly Eli Lilly and Company (Lilly) took three exclusive development and commercialization licenses under a now-expired right-to-test agreement established in 2011. The Company received a $20 million upfront payment in connection with the execution of the right‑to‑test agreement in 2011. Under the terms of this right-to-test agreement, the first license had no associated exercise fee, and the second and third licenses each had a $2 million exercise fee. The first development and commercialization license was taken in August 2013 and the agreement was amended in December 2013 to provide Lilly with an extension provision and retrospectively include a $2 million exercise fee for the first license in lieu of the fee due for either the second or third license. The second and third licenses were taken in December 2014, with one including the $2 million exercise fee and the other not. Under the two licenses with the $2 million exercise fee, the Company is entitled to receive up to a total of $199 million in milestone payments, plus royalties on the commercial sales of any resulting products. Under the license taken in December 2014 without the exercise fee, the Company is entitled to receive up to a total of $200.5 million in milestone payments, plus royalties on the commercial sales of any resulting products. The total milestones are categorized as follows: development milestones—$29 million for the two development and commercialization licenses with the $2 million exercise fee, and $30.5 million for the one development and commercialization license with no exercise fee; regulatory milestones—$70 million in all cases; and sales milestones—$100 million in all cases. In September 2015, Lilly began Phase I evaluation of one of its licensed ADC products which triggered a $5 million milestone payment to the Company which is included in license and milestone fee revenue for the three months ended September 30, 2015. The next payment the Company could receive would be either a $9 million development milestone for commencement of a Phase II clinical trial under this license or a $5 million development milestone payment with the initiation of a Phase I clinical trial under either of its other two development and commercialization licenses taken. At the time of execution of this agreement, there was significant uncertainty as to whether these milestones would be achieved. In consideration of this, as well as the Company’s expected involvement in the research and manufacturing of these product candidates, these milestones were deemed substantive. The Company also is entitled to receive payments for delivery of cytotoxic agents to Lilly and research and development activities performed on behalf of Lilly. Lilly is responsible for the manufacturing, product development and marketing of any products resulting from this collaboration. For additional information related to these agreements, as well as the Company’s other significant collaborative agreements, please read Note C, Agreements, to our consolidated financial statements included within the Company’s 2016 Form 10-K

C. Agreements

Significant Collaborative Agreements

Roche

In 2000, the Company granted Genentech, now a unit of Roche, an exclusive license to use the Company’s maytansinoid ADC technology with antibodies, such as trastuzumab, or other proteins that target HER2. Under the terms of this agreement, Roche has exclusive worldwide rights to develop and commercialize maytansinoid ADC compounds targeting HER2. In 2013, the HER2‑targeting ADC compound, Kadcyla, was approved for marketing in the U.S., Japan and the European Union, or EU. Roche has also received marketing approval in various other countries around the world. Roche is responsible for the manufacturing, product development and marketing of any products resulting from the agreement. The Company received a $2 million non‑refundable upfront payment from Roche upon execution of the agreement. The Company is also entitled to receive up to a total of $44 million in milestone payments, plus royalties on the commercial sales of Kadcyla or any other resulting products. Total milestones are categorized as follows: development milestones—$13.5 million; and regulatory milestones—$30.5 million. Through September 30, 2016, the Company has received and recognized $13.5 million and $20.5 million in development and regulatory milestone payments, respectively, related to Kadcyla. The next potential milestone the Company will be entitled to receive will be a $5 million regulatory milestone for marketing approval of Kadcyla for a first extended indication as defined in the agreement. Based on an evaluation of the effort contributed towards the achievement of this future milestone, the Company determined this milestone is not substantive.

The Company receives royalty reports and payments related to sales of Kadcyla from Roche one quarter in arrears. In accordance with the Company’s revenue recognition policy, $6.2 million of non-cash royalties on net sales of Kadcyla for the three‑month period ended June 30, 2016 were recorded and included in non-cash royalty revenue for the three-month period ended September 30, 2016 and $5.7 million of non-cash royalties on net sales of Kadcyla for the three‑month period ended June 30, 2015 is included in non-cash royalty revenue for the three-month period ended September 30, 2015. Kadcyla sales occurring after January 1, 2015 are covered by a royalty purchase agreement whereby the associated cash is remitted to Immunity Royalty Holdings, L.P, or IRH, as discussed further in Note E.

Amgen

Under a now‑expired right‑to‑test agreement established in 2000, Amgen took three exclusive development and commercialization licenses, for which the Company received an exercise fee of $1 million for each license taken. In May 2013, Amgen took one non‑exclusive development and commercialization license, for which the Company received an exercise fee of $500,000. In October 2013, the non‑exclusive license was amended and converted to an exclusive license, for which Amgen paid an additional $500,000 fee to the Company. Amgen has sublicensed its rights under this license to Oxford BioTherapeutics Ltd. In December 2015, Amgen advised the Company that it had discontinued development of two product candidates, AMG 595 and AMG 172 that had been covered by two of Amgen’s four exclusive licenses, and in February 2016, Amgen terminated these two licenses.

For each of the two remaining development and commercialization license taken, the Company is entitled to receive up to a total of $34 million in milestone payments, plus royalties on the commercial sales of any resulting products. The total milestones per license are categorized as follows: development milestones—$9 million; regulatory milestones—$20 million; and sales milestones—$5 million. Amgen (or its sublicensee(s)) is responsible for the manufacturing, product development and marketing of any products resulting from these development and commercialization licenses. Through September 30, 2016, the Company has received and recognized an aggregate of $3 million in milestone payments for compounds covered under this agreement now or in the past. In September 2015, Amgen’s IND application under the remaining license not sublicensed to Oxford BioTherapeutics became effective, triggering a $1 million milestone payment to the Company which is included in license and milestone fee revenue for the three month period ended September 30, 2015. The next potential milestone the Company will be entitled to receive under this license will be a development milestone for the first dosing of a patient in a Phase II clinical trial, which will result in a $3 million payment being due. The next potential milestone the Company will be entitled to receive under the May 2013 license will be a $1 million development milestone for an IND becoming effective. At the time of execution of each of these development and commercialization licenses, there was significant uncertainty as to whether these milestones would be achieved. In consideration of this, as well as the Company’s past involvement in the research and manufacturing of these product candidates, these milestones were deemed substantive.

Lilly

Eli Lilly and Company (Lilly) took three exclusive development and commercialization licenses under a now-expired right-to-test agreement established in 2011. The Company received a $20 million upfront payment in connection with the execution of the right‑to‑test agreement in 2011. Under the terms of this right-to-test agreement, the first license had no associated exercise fee, and the second and third licenses each had a $2 million exercise fee. The first development and commercialization license was taken in August 2013 and the agreement was amended in December 2013 to provide Lilly with an extension provision and retrospectively include a $2 million exercise fee for the first license in lieu of the fee due for either the second or third license. The second and third licenses were taken in December 2014, with one including the $2 million exercise fee and the other not. Under the two licenses with the $2 million exercise fee, the Company is entitled to receive up to a total of $199 million in milestone payments, plus royalties on the commercial sales of any resulting products. Under the license taken in December 2014 without the exercise fee, the Company is entitled to receive up to a total of $200.5 million in milestone payments, plus royalties on the commercial sales of any resulting products. The total milestones are categorized as follows: development milestones—$29 million for the two development and commercialization licenses with the $2 million exercise fee, and $30.5 million for the one development and commercialization license with no exercise fee; regulatory milestones—$70 million in all cases; and sales milestones—$100 million in all cases. In September 2015, Lilly began Phase I evaluation of one of its licensed ADC products which triggered a $5 million milestone payment to the Company which is included in license and milestone fee revenue for the three months ended September 30, 2015. The next payment the Company could receive would be either a $9 million development milestone for commencement of a Phase II clinical trial under this license or a $5 million development milestone payment with the initiation of a Phase I clinical trial under either of its other two development and commercialization licenses taken. At the time of execution of this agreement, there was significant uncertainty as to whether these milestones would be achieved. In consideration of this, as well as the Company’s expected involvement in the research and manufacturing of these product candidates, these milestones were deemed substantive. The Company also is entitled to receive payments for delivery of cytotoxic agents to Lilly and research and development activities performed on behalf of Lilly. Lilly is responsible for the manufacturing, product development and marketing of any products resulting from this collaboration.

For additional information related to these agreements, as well as the Company’s other significant collaborative agreements, please read Note C, Agreements, to our consolidated financial statements included within the Company’s 2016 Form 10-K