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Leases - Schedule of Subleasing (Details) $ in Thousands	Dec. 31, 2024 USD ($)
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