Price per share or per unit of warrants or rights outstanding.

No definition available.

Name:	adth_ClassOfWarrantOrRightPriceOfWarrantsOrRights
Namespace Prefix:	adth_
Data Type:	dtr-types:perShareItemType
Balance Type:	na
Period Type:	instant

- Definition

Number of securities into which the class of warrant or right may be converted. For example, but not limited to, 500,000 warrants may be converted into 1,000,000 shares.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=123467817&loc=d3e21475-112644

+ Details

Name:	us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

The cash inflow from issuance of rights to purchase common shares at predetermined price (usually issued together with corporate debt).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 14
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3255-108585

+ Details

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

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_SubsidiarySaleOfStockLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	dei_LegalEntityAxis=adth_McapAcquisitionCorpMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_SubsidiarySaleOfStockAxis=us-gaap_PrivatePlacementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ClassOfWarrantOrRightAxis=adth_PrivatePlacementWarrantsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_SubsidiarySaleOfStockAxis=us-gaap_OverAllotmentOptionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Private Placement (Details) - Mcap Acquisition Corp [Member] - USD ($)		2 Months Ended	9 Months Ended
	Mar. 02, 2021	Dec. 31, 2020	Sep. 30, 2021	Dec. 21, 2020
Subsidiary, Sale of Stock [Line Items]
Number of warrants outstanding	5,983,333		5,983,333
Price of warrants	$ 1.50		$ 1.50
Aggregate purchase price			$ 8,975,000
Private Placement [Member] \| Private Placement Warrants
Subsidiary, Sale of Stock [Line Items]
Number of warrants outstanding	5,983,333	5,433,333	5,983,333
Price of warrants	$ 1.50	$ 1.50	$ 1.50
Aggregate purchase price	$ 8,975,000	$ 8,150,000	$ 8,975,000
Over-Allotment Option [Member] \| Private Placement Warrants
Subsidiary, Sale of Stock [Line Items]
Number of warrants outstanding		5,983,333		5,983,333
Aggregate purchase price		$ 8,975,000