Legal Matters	12 Months Ended
Dec. 31, 2013
Commitments and Contingencies Disclosure [Abstract]
Legal Matters	Legal Matters From time to time, the Company is a party to legal proceedings in the course of the Company's business. The Company does not expect any such current legal proceedings to have a material adverse effect on the Company's business or financial condition. Costs associated with the Company's involvement in legal proceedings are expensed as incurred. Proceedings Relating to ‘287 Patent As described more specifically below, the Company is a party to patent infringement litigation involving its European Patent No. 1,360,287 (the “‘287 Patent”), which concerns genetically altered mice capable of producing chimeric antibodies that are part human and part mouse. Chimeric antibody sequences can be used to produce high-affinity fully human monoclonal antibodies. In these proceedings (referred to below as “‘287 Patent Infringement Litigation”), the Company claims infringement of several of the ‘287 Patent, and seeks, among other types of relief, an injunction and an account of profits in connection with the defendants’ infringing acts, which may include, among other things, the making, use, keeping, sale, or offer for sale of genetically engineered mice (or certain cells from which they are derived) that infringe one or more claims of the ‘287 Patent. On September 25, 2013, the Company commenced ‘287 Patent Infringement Litigation against Kymab Ltd, a company based in the United Kingdom, in the English High Court of Justice, Chancery Division, Patents Court, in London. On December 18, 2013, Kymab filed a defense to the Company's lawsuit and counterclaimed alleging invalidity of the '287 Patent. Kymab previously filed an opposition to the '287 Patent in the European Patent Office in June 2013. On January 3, 2014, the Company commenced ‘287 Patent Infringement Litigation against Novo Nordisk A/S, a company based in Denmark, in the English High Court of Justice, Chancery Division, Patents Court, in London. As the '287 Patent Infringement Litigation proceedings are at an early stage, at this time the Company is not able to predict the outcome or an estimate of gain, if any, related to these proceedings.

Legal Matters

From time to time, the Company is a party to legal proceedings in the course of the Company's business. The Company does not expect any such current legal proceedings to have a material adverse effect on the Company's business or financial condition. Costs associated with the Company's involvement in legal proceedings are expensed as incurred.

Proceedings Relating to ‘287 Patent

As described more specifically below, the Company is a party to patent infringement litigation involving its European Patent No. 1,360,287 (the “‘287 Patent”), which concerns genetically altered mice capable of producing chimeric antibodies that are part human and part mouse. Chimeric antibody sequences can be used to produce high-affinity fully human monoclonal antibodies. In these proceedings (referred to below as “‘287 Patent Infringement Litigation”), the Company claims infringement of several of the ‘287 Patent, and seeks, among other types of relief, an injunction and an account of profits in connection with the defendants’ infringing acts, which may include, among other things, the making, use, keeping, sale, or offer for sale of genetically engineered mice (or certain cells from which they are derived) that infringe one or more claims of the ‘287 Patent.

On September 25, 2013, the Company commenced ‘287 Patent Infringement Litigation against Kymab Ltd, a company based in the United Kingdom, in the English High Court of Justice, Chancery Division, Patents Court, in London. On December 18, 2013, Kymab filed a defense to the Company's lawsuit and counterclaimed alleging invalidity of the '287 Patent. Kymab previously filed an opposition to the '287 Patent in the European Patent Office in June 2013.

On January 3, 2014, the Company commenced ‘287 Patent Infringement Litigation against Novo Nordisk A/S, a company based in Denmark, in the English High Court of Justice, Chancery Division, Patents Court, in London.

As the '287 Patent Infringement Litigation proceedings are at an early stage, at this time the Company is not able to predict the outcome or an estimate of gain, if any, related to these proceedings.