Symetryml And Symetryml Holdings - Summary of Amounts Related to Accounting for Deconsolidation Transaction (Details) $ in Thousands	3 Months Ended
Mar. 31, 2022 USD ($)
Equity [Abstract]
Fair value of retained noncontrolling interest	$ 861
Carrying amount of deconsolidated noncontrolling interest	2,372
Less: Carrying amount of deconsolidated net assets	(1,294)
Gain on deconsolidation	$ 1,939

Carrying amount of deconsolidated noncontrolling interest.

No definition available.

Name:	adth_CarryingAmountOfDeconsolidatedNoncontrollingInterest
Namespace Prefix:	adth_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration