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The floor amount as of the balance sheet date that the entity must expend to satisfy the terms of disclosed arrangements.

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Success fee amount payable in connection with an acquisition.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

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Amount of required minimum rental payments for leases having an initial or remaining non-cancelable letter-terms in excess of one year.

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Commitments and Contingencies (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Future minimum annual payments under operating lease agreements [Abstract]
2013	$ 2,410
2014	2,410
2015	2,470
2016	2,532
2017	2,595
Thereafter	8,182
Total	20,599
Rental expense	2,074	3,475	3,544
Adjustments to rental expense	419	63	181
Additional facility charges	2,845	4,033	3,645
Licensing, Service, Supply and Related Party Agreements [Abstract]
License fees and supply costs	1,170	578	1,266
Consulting Agreements [Abstract]
Expenses with regard to consulting agreements with scientific specialists	8	27	179
Fair value of options vested included in consulting expenses (in dollars per share)		11	42
Retirement Agreement [Abstract]
Expenses for termination of employment agreement	1,789
MTS-Related Party Agreement
Consulting agreement monthly retainer amount	10
Success fee	300
Lonza Sales AG [Member] \| Parent Company [Member]
Licensing, Service, Supply and Related Party Agreements [Abstract]
Commitments, paid from inception	909
Future Commitments	808
Terms	Annual license fee payments, milestones and royalties, as applicable, in respect of oncology and other products.
Seattle Genetics, Inc. [Member] \| PSMA Development Company LLC [Member]
Licensing, Service, Supply and Related Party Agreements [Abstract]
Commitments, paid from inception	4,400
Future Commitments	13,800
Terms	Milestone and periodic maintenance payments to use ADC technology to link chemotherapeutic agents to monoclonal antibodies that target prostate specific membrane antigen. ADC technology is based in part on technology licensed by SGI from third parties.
Amgen Fremont, Inc. (formerly Abgenix) [Member] \| PSMA Development Company LLC [Member]
Licensing, Service, Supply and Related Party Agreements [Abstract]
Commitments, paid from inception	1,350
Future Commitments	5,750
Terms	Milestones and royalties to use XenoMouse® technology for generating fully human antibodies to PSMA LLC's PSMA antigen.
Former Member of PSMA LLC [Member] \| PSMA Development Company LLC [Member]
Licensing, Service, Supply and Related Party Agreements [Abstract]
Commitments, paid from inception	241
Future Commitments	$ 52,216
Terms	Annual minimum royalty payments and milestones to use technology related to PSMA.