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Basis of Presentation and Summary of Significant Accounting Policies - Leases (Details)	Dec. 31, 2025
Office Equipment
Property, Plant and Equipment [Line Items]
Lease term, extension period	5 years

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- Definition

Lessee, Operating Lease, Term of Contract, Extension Period

+ References

No definition available.

+ Details

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Namespace Prefix:	pubm_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	instant

X

- 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

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 842
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 7A
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478964/842-20-50-7A

+ Details

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Balance Type:	na
Period Type:	duration

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- Details

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Namespace Prefix:
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