XML 51 R41.htm IDEA: XBRL DOCUMENT
v3.25.1

Other Long-Term Liabilities - Additional Information (Details) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended
--- | --- | ---
Mar. 31, 2022 | Mar. 31, 2025 | Mar. 31, 2024
Other Long-Term Liabilities |  |  |
Other income |  | $ 8,943 | $ 7,800
New Jersey Economic Development Authority |  |  |
Other Long-Term Liabilities |  |  |
Amount of tax benefit | $ 5,000 |  |
Proceeds from sale of tax credits | $ 4,700 |  |
Base of operations requirement (in years) | 5 years |  |
Other income |  | $ 900 | $ 900

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | cldx_OtherNonCurrentLiabilitiesLineItems
Namespace Prefix: | cldx_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents period for which base of operations must be maintained in New Jersey. + References No definition available. + Details
Name: | cldx_PeriodForWhichBaseOfOperationsMustBeMaintained
Namespace Prefix: | cldx_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition The amount of net proceeds received or will be received from the sale of net operating losses and research and development tax credits under New Jersey. + References No definition available. + Details
Name: | cldx_ProceedsFromSaleOfOperatingLossesAndTaxCredits
Namespace Prefix: | cldx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of current state and local tax expense (benefit) attributable to income (loss) from continuing operations. Includes, but is not limited to, current regional, territorial, and provincial tax expense (benefit) for non-US (United States of America) jurisdiction. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 6.I.7) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479360/740-10-S99-1 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 235 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(h)(1)(Note 1)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480678/235-10-S99-1 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Name Accounting Standards Codification -Section 50 -Paragraph 9 -Subparagraph (a) -SubTopic 10 -Topic 740 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-9 + Details
Name: | us-gaap_CurrentStateAndLocalTaxExpenseBenefit
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The amount of interest income and other income recognized during the period. Included in this element is interest derived from investments in debt securities, cash and cash equivalents, and other investments which reflect the time value of money or transactions in which the payments are for the use or forbearance of money and other income from ancillary business-related activities (that is, excluding major activities considered part of the normal operations of the business). + References No definition available. + Details
Name: | us-gaap_InterestAndOtherIncome
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | dei_LegalEntityAxis=cldx_NewJerseyEconomicDevelopmentAuthorityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |