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Commitments and Contingencies - Additional Information (Detail) - USD ($) $ in Millions	1 Months Ended	3 Months Ended		9 Months Ended
	Jan. 31, 2021	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Defined contribution plan, contribution amount		$ 1.0	$ 0.9	$ 3.0	$ 2.5
Recorded unconditional purchase commitment, minimum quantity required	$ 9.5	5.0		5.0
Recorded unconditional purchase commitment, maturity year and month	2029-12
Remaining purchase commitment	$ 9.5	$ 5.0		$ 5.0
First 3% of Compensation Contributed [Member]
Defined contribution plan, matching percentage of each employee's contribution				100.00%
100% Match [Member]
Defined contribution plan, percentage of matching contribution				3.00%
Excess of 3% to 5% of Compensation Contributed [Member]
Defined contribution plan, matching percentage of each employee's contribution				50.00%
Fifty Percent Match [Member] | Additional Maximum [Member]
Defined contribution plan, percentage of matching contribution				2.00%

X

- Definition

Maturity year and month of recorded unconditional purchase commitment.

+ References

No definition available.

+ Details

Name:	tmdx_RecordedUnconditionalPurchaseCommitmentMaturityYearAndMonth
Namespace Prefix:	tmdx_
Data Type:	xbrli:gYearMonthItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of discretionary contributions made by an employer to a defined contribution plan.

+ References

No definition available.

+ Details

Name:	us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan.

+ References

No definition available.

+ Details

Name:	us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Percentage employer matches of the employee's percentage contribution matched.

+ References

No definition available.

+ Details

Name:	us-gaap_DefinedContributionPlanEmployerMatchingContributionPercentOfMatch
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of the recorded obligation to transfer funds in the future for fixed or minimum amounts or quantities of goods or services at fixed or minimum prices (for example, as in take-or-pay contracts or throughput contracts).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 440
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 6
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482648/440-10-50-6

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Details

Name:	us-gaap_RetirementPlanTypeAxis=tmdx_FirstThreePercentOfCompensationContributedMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_RetirementPlanTypeAxis=tmdx_OneHundredPercentMatchMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_RetirementPlanTypeAxis=tmdx_ExcessOfThreePercentToFivePercentOfCompensationContributedMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_RetirementPlanTypeAxis=tmdx_FiftyPercentMatchMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_StatementScenarioAxis=tmdx_AdditionalMaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: