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Term Loan (Details) (Term Loan, USD $) In Millions, unless otherwise specified | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
May 31, 2013 | Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 | Sep. 30, 2012
Term Loan |  |  |  |  |
Term Loan |  |  |  |  |
Repayment of principal amount | $ 8.8 |  |  |  |
Amount of interest, prepayment and final payment fees | 0.7 |  |  |  |
Interest expense on the term loan |  | $ 0 | $ 0.4 | $ 0.8 | $ 1.2

X
- Definition Represents the amount of interest, prepayment and final payment fees paid by the entity. + References No definition available. + Details
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Namespace Prefix: | cldx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Represents the amount of principal repaid by the entity. + References No definition available. + Details
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Namespace Prefix: | cldx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Aggregate amount of interest paid or due on all long-term debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 8 -Article 9 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.8) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration