Represents the number of shares in a unit.

No definition available.

Name:	adth_NumberOfSharesIssuedPerUnit
Namespace Prefix:	adth_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents the number of warrants in a unit.

+ References

No definition available.

+ Details

Name:	adth_NumberOfWarrantsIssuedPerUnit
Namespace Prefix:	adth_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

Number of new units issued during the period.

+ References

No definition available.

+ Details

Name:	adth_UnitsIssuedDuringPeriodSharesNewIssues
Namespace Prefix:	adth_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

Exercise price per share or per unit of warrants or rights outstanding.

+ 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_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:perShareItemType
Balance Type:	na
Period Type:	instant

- Definition

Number of securities into which each warrant or right may be converted. For example, but not limited to, each warrant may be converted into two shares.

+ References

No definition available.

+ Details

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

- Definition

Face amount or stated value per share of common stock.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(29))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

+ Details

Name:	us-gaap_CommonStockParOrStatedValuePerShare
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:perShareItemType
Balance Type:	na
Period Type:	instant

- Definition

Per share or per unit amount of equity securities issued.

+ References

No definition available.

+ Details

Name:	us-gaap_SharesIssuedPricePerShare
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:perShareItemType
Balance Type:	na
Period Type:	instant

- 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_StatementClassOfStockAxis=us-gaap_CommonClassAMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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

- Details

Name:	us-gaap_ClassOfWarrantOrRightAxis=adth_PublicWarrantsMember
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:

Initial Public Offering (Details) - Mcap Acquisition Corp [Member] - $ / shares			2 Months Ended
	Mar. 02, 2021	Feb. 03, 2021	Dec. 31, 2020	Sep. 30, 2021
Subsidiary, Sale of Stock [Line Items]
Number of units sold	31,625,000
Shares Issued, Price Per Share	$ 10.00		$ 10.00
Common Class A [Member]
Subsidiary, Sale of Stock [Line Items]
Common shares, par value, (per share)	$ 0.0001		$ 0.0001	$ 0.0001
IPO [Member]
Subsidiary, Sale of Stock [Line Items]
Number of units sold	31,625,000	31,625,000	27,500,000
Shares Issued, Price Per Share	$ 10.00	$ 10.00	$ 10.00
IPO [Member] \| Common Class A [Member]
Subsidiary, Sale of Stock [Line Items]
Number of shares in a unit	1	1
Common shares, par value, (per share)	$ 0.0001	$ 0.0001
IPO [Member] \| Public Warrants
Subsidiary, Sale of Stock [Line Items]
Shares Issued, Price Per Share			$ 0.0001
Number of shares in a unit			1
Number of warrants in a unit	1	1	1
Number of shares issuable per warrant			1
Exercise price of warrants			$ 11.50
IPO [Member] \| Public Warrants \| Common Class A [Member]
Subsidiary, Sale of Stock [Line Items]
Number of shares issuable per warrant	1	1
Exercise price of warrants	$ 11.50	$ 11.50
Over-Allotment Option [Member]
Subsidiary, Sale of Stock [Line Items]
Number of units sold	4,125,000		31,625,000