CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Parenthetical) $ in Thousands	12 Months Ended
Dec. 31, 2020 USD ($)
Statement Of Stockholders Equity [Abstract]
Discounts and issuance costs of stock issued	$ 585

Discounts and costs incurred directly with the issuance of an equity security.

No definition available.

Name:	tmdx_DiscountsAndStockIssuanceCosts
Namespace Prefix:	tmdx_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration