Subsequent Events	3 Months Ended
Mar. 31, 2016
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events Entry into European Transaction On May 9, 2016, ARIAD and its wholly-owned subsidiary ARIAD Pharmaceuticals (Cayman) L.P. (the “Seller”) entered into a Share Purchase Agreement (the “Share Purchase Agreement”) with Incyte Corporation (“Incyte”) (as guarantor) and its wholly-owned subsidiary Incyte Europe S.a.r.l. (“Incyte Europe”), pursuant to which Incyte Europe has agreed to acquire from the Seller all of the outstanding shares of ARIAD Pharmaceuticals (Luxembourg) S.a.r.l., the parent company of ARIAD’s European subsidiaries responsible for the commercialization of Iclusig® (ponatinib) in the European Union (“EU”) and 22 other countries, including Switzerland, Norway, Turkey, Israel and Russia (the “Territory”), for an upfront payment of $140 million (the “Upfront Payment”). In connection with the transactions contemplated by the Share Purchase Agreement, the parties have also agreed on an Amended and Restated Buy-in License Agreement to be entered into between ARIAD, Incyte (as guarantor) and ARIAD Pharmaceuticals (Europe) S.a.r.l., one of the entities that will be owned by Incyte upon the closing of the transactions contemplated by the Share Purchase Agreement (the “License Agreement”). Under the terms of the License Agreement, Incyte will be granted an exclusive license to develop and commercialize Iclusig in the Territory (the “License”). ARIAD will be entitled to receive tiered royalties from Incyte of between 32 percent and 50 percent of net sales of Iclusig in the Territory (the “Royalty Payments”). The Royalty Payments will be subject to adjustment for certain events, including events related to the expiration of statutory or regulatory exclusivity periods for the commercialization of Iclusig in the Territory. In addition, ARIAD will be eligible to receive up to $135 million in potential development and regulatory milestones for Iclusig in new oncology indications in the Territory, together with additional milestones for non-oncology indications, if approved, in the Territory. Incyte has agreed to contribute up to $7.0 million in each of 2016 and 2017 to fund ARIAD’s OPTIC and OPTIC-2L clinical trials. The terms of the License Agreement also include an option for an acquirer of ARIAD to re-purchase the licensed rights from Incyte, subject to certain conditions. Unless terminated earlier in accordance with its provisions, the term of the License Agreement, including Incyte's obligation to make the full Royalty Payments, will continue in effect on a country-by-country basis until the latest to occur of (1) the expiration date of the composition patent in the relevant country (which, for the countries in Europe covered by our patents, is generally July 2028, subject to a potential six-month extension for pediatric exclusivity), (2) the expiration of any regulatory marketing exclusivity period or other statutory designation that provides similar exclusivity for the commercialization of Iclusig in such country and (3) the seventh anniversary of the first commercial sale of Iclusig in such country; and thereafter, in the absence of generic competition, for a specified period of time in which Incyte will be obligated to pay royalties at a reduced rate. The closing under the Share Purchase Agreement and effectiveness of the License Agreement is currently expected to occur on or about June 1, 2016, subject to satisfaction of customary closing conditions. Amendment to Royalty Financing On May 9, 2016, in connection with the transactions with Incyte, ARIAD and PDL agreed to amend the RIAA to, among other things, include in the Iclusig net sales calculation under the RIAA net sales of Iclusig made by Incyte in the Territory under the License Agreement. In addition, ARIAD’s option to receive additional funding was restructured so that ARIAD may require PDL to fund up to an additional $40 million (instead of the original $100 million) in July 2017 (instead of between January and July 2016). In connection with the amendment to the RIAA, ARIAD and PDL also agreed to release ARIAD’s European patents and certain other European assets from the collateral. These agreements with PDL are subject to and effective upon the closing of the Incyte transaction.

Subsequent Events

Entry into European Transaction

On May 9, 2016, ARIAD and its wholly-owned subsidiary ARIAD Pharmaceuticals (Cayman) L.P. (the “Seller”) entered into a Share Purchase Agreement (the “Share Purchase Agreement”) with Incyte Corporation (“Incyte”) (as guarantor) and its wholly-owned subsidiary Incyte Europe S.a.r.l. (“Incyte Europe”), pursuant to which Incyte Europe has agreed to acquire from the Seller all of the outstanding shares of ARIAD Pharmaceuticals (Luxembourg) S.a.r.l., the parent company of ARIAD’s European subsidiaries responsible for the commercialization of Iclusig® (ponatinib) in the European Union (“EU”) and 22 other countries, including Switzerland, Norway, Turkey, Israel and Russia (the “Territory”), for an upfront payment of $140 million (the “Upfront Payment”).

In connection with the transactions contemplated by the Share Purchase Agreement, the parties have also agreed on an Amended and Restated Buy-in License Agreement to be entered into between ARIAD, Incyte (as guarantor) and ARIAD Pharmaceuticals (Europe) S.a.r.l., one of the entities that will be owned by Incyte upon the closing of the transactions contemplated by the Share Purchase Agreement (the “License Agreement”). Under the terms of the License Agreement, Incyte will be granted an exclusive license to develop and commercialize Iclusig in the Territory (the “License”). ARIAD will be entitled to receive tiered royalties from Incyte of between 32 percent and 50 percent of net sales of Iclusig in the Territory (the “Royalty Payments”). The Royalty Payments will be subject to adjustment for certain events, including events related to the expiration of statutory or regulatory exclusivity periods for the commercialization of Iclusig in the Territory. In addition, ARIAD will be eligible to receive up to $135 million in potential development and regulatory milestones for Iclusig in new oncology indications in the Territory, together with additional milestones for non-oncology indications, if approved, in the Territory. Incyte has agreed to contribute up to $7.0 million in each of 2016 and 2017 to fund ARIAD’s OPTIC and OPTIC-2L clinical trials. The terms of the License Agreement also include an option for an acquirer of ARIAD to re-purchase the licensed rights from Incyte, subject to certain conditions.

Unless terminated earlier in accordance with its provisions, the term of the License Agreement, including Incyte's obligation to make the full Royalty Payments, will continue in effect on a country-by-country basis until the latest to occur of (1) the expiration date of the composition patent in the relevant country (which, for the countries in Europe covered by our patents, is generally July 2028, subject to a potential six-month extension for pediatric exclusivity), (2) the expiration of any regulatory marketing exclusivity period or other statutory designation that provides similar exclusivity for the commercialization of Iclusig in such country and (3) the seventh anniversary of the first commercial sale of Iclusig in such country; and thereafter, in the absence of generic competition, for a specified period of time in which Incyte will be obligated to pay royalties at a reduced rate.

The closing under the Share Purchase Agreement and effectiveness of the License Agreement is currently expected to occur on or about June 1, 2016, subject to satisfaction of customary closing conditions.

Amendment to Royalty Financing

On May 9, 2016, in connection with the transactions with Incyte, ARIAD and PDL agreed to amend the RIAA to, among other things, include in the Iclusig net sales calculation under the RIAA net sales of Iclusig made by Incyte in the Territory under the License Agreement. In addition, ARIAD’s option to receive additional funding was restructured so that ARIAD may require PDL to fund up to an additional $40 million (instead of the original $100 million) in July 2017 (instead of between January and July 2016). In connection with the amendment to the RIAA, ARIAD and PDL also agreed to release ARIAD’s European patents and certain other European assets from the collateral. These agreements with PDL are subject to and effective upon the closing of the Incyte transaction.