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COLLABORATION AGREEMENTS (Details) (License agreements, USD $) In Millions, unless otherwise specified | 12 Months Ended |  | 1 Months Ended |  | 1 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2012 Medarex Maximum | Dec. 31, 2012 Rockefeller Maximum | Dec. 31, 2012 Duke Maximum | Oct. 31, 2006 Ludwig | Dec. 31, 2012 Ludwig Maximum | Dec. 31, 2012 Alteris Maximum | Feb. 28, 2003 TJU item | Dec. 31, 2012 TJU Maximum | Dec. 31, 2012 Southampton Maximum | Dec. 31, 2012 Amgen Maximum | Dec. 31, 2012 Seattle Genetics CuraGen Maximum
Collaboration Agreements |  |  |  |  |  |  |  |  |  |  |  |  |  |
Nonrefundable license fee expense | $ 0.7 | $ 1.4 | $ 1.0 |  |  |  |  |  |  |  |  |  |  |
Period from the first commercial sale of licensed product for royalty payment |  |  |  | 10 years |  |  |  |  |  |  |  |  |  |
Milestone payment due |  |  |  | $ 7.0 | $ 3.9 | $ 1.0 |  | $ 1.0 | $ 5.0 |  | $ 3.0 | $ 1.4 | $ 1.0 | $ 7.5
Term of the agreement |  |  |  |  |  |  | 10 years |  |  |  |  |  |  |
Number of exclusive license agreements |  |  |  |  |  |  |  |  |  | 2 |  |  |  |

X
- Definition Represents the term of the collaborative arrangement. + References No definition available. + Details
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- Definition Represents the number of exclusive license agreements under the collaborative arrangement. + References No definition available. + Details
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- Definition Represents the period from the first commercial sale of licensed product for royalty payment under the collaborative arrangement. + References No definition available. + Details
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Namespace Prefix: | cldx_
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X
- Definition Represents the total amount of potential milestone payments to be made by the entity based on terms of the collaborative arrangement. + References No definition available. + Details
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Namespace Prefix: | cldx_
Data Type: | xbrli:monetaryItemType
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Period Type: | instant

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Namespace Prefix: | cldx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
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