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Leases - Schedule of Subleasing (Details) $ in Thousands | Dec. 31, 2024 USD ($)
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Leases [Abstract] |
2025 | $ 1,379
2026 | 1,067
Total sublease income payments | $ 2,446

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- Definition Lessee operating leases future minimum payments due future minimum sublease rentals. + References No definition available. + Details
Name: | ctmx_LesseeOperatingLeasesFutureMinimumPaymentsDueFutureMinimumSubleaseRentals
Namespace Prefix: | ctmx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Lessee operating leases future minimum payments due future minimum sublease rentals due in next twelve months. + References No definition available. + Details
Name: | ctmx_LesseeOperatingLeasesFutureMinimumPaymentsDueFutureMinimumSubleaseRentalsDueInNextTwelveMonths
Namespace Prefix: | ctmx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Lessee operating leases future minimum payments due future minimum sublease rentals due in year two. + References No definition available. + Details
Name: | ctmx_LesseeOperatingLeasesFutureMinimumPaymentsDueFutureMinimumSubleaseRentalsDueInYearTwo
Namespace Prefix: | ctmx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- References No definition available. + Details
Name: | us-gaap_LeasesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration