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Income Taxes (Details) | Sep. 30, 2013 item
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Net operating loss and tax credit carryforwards |
Number of states in which the entity primarily operates or has operated and has income tax nexus | 3

X
- Details
Name: | cldx_OperatingLossAndTaxCreditCarryforwardsLineItems
Namespace Prefix: | cldx_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The number of states the entity operates in as of the balance sheet date. + References No definition available. + Details
Name: | us-gaap_NumberOfStatesInWhichEntityOperates
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant