v3.22.4

Loan and Security Agreement and Senior Secured Credit Facilities Agreement (Details) - Revolving Credit Facility - USD ($) $ in Millions		1 Months Ended
	Oct. 17, 2022	Jun. 30, 2021
Credit Agreement | Line of Credit
Line of Credit Facility [Line Items]
Maximum borrowing capacity	$ 110.0
Line of credit facility, accordion feature, increase limit	$ 90.0
Credit Agreement | Line of Credit | Minimum
Line of Credit Facility [Line Items]
Line of credit facility, commitment fee percentage	0.25%
Credit Agreement | Line of Credit | Maximum
Line of Credit Facility [Line Items]
Line of credit facility, commitment fee percentage	0.35%
Credit Agreement | Line of Credit | Fed Funds Effective Rate Overnight Index Swap Rate
Line of Credit Facility [Line Items]
Debt instrument, basis spread on variable rate	0.50%
Credit Agreement | Line of Credit | Secured Overnight Financing Rate (SOFR)
Line of Credit Facility [Line Items]
Debt instrument, basis spread on variable rate	1.00%
Credit Agreement | Line of Credit | Secured Overnight Financing Rate (SOFR) | Minimum
Line of Credit Facility [Line Items]
Debt instrument, basis spread on variable rate	2.00%
Credit Agreement | Line of Credit | Secured Overnight Financing Rate (SOFR) | Maximum
Line of Credit Facility [Line Items]
Debt instrument, basis spread on variable rate	2.75%
Credit Agreement | Line of Credit | Alternate Base Rate | Minimum
Line of Credit Facility [Line Items]
Debt instrument, basis spread on variable rate	1.00%
Credit Agreement | Line of Credit | Alternate Base Rate | Maximum
Line of Credit Facility [Line Items]
Debt instrument, basis spread on variable rate	1.75%
Credit Agreement | Letter of Credit
Line of Credit Facility [Line Items]
Maximum borrowing capacity	$ 25.0
Credit Agreement | Swingline Sub-Facility
Line of Credit Facility [Line Items]
Maximum borrowing capacity	$ 25.0
Silicon Valley Bank
Line of Credit Facility [Line Items]
Maximum borrowing capacity		$ 25.0
Line of credit facility, borrowing capacity, percentage of eligible accounts receivable, net,		80.00%
Debt instrument, interest rate		3.25%
Line of credit facility, unused capacity, commitment fee percentage		0.40%
Line of credit facility, borrowing capacity, unused capacity fee, closing balance threshold		$ 5.0

X

- Definition

Line of Credit Facility, Accordion Feature, Increase Limit

+ References

No definition available.

+ Details

Name:	pubm_LineOfCreditFacilityAccordionFeatureIncreaseLimit
Namespace Prefix:	pubm_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Line Of Credit Facility, Borrowing Capacity, Percentage Of Eligible Accounts Receivable, Net,

+ References

No definition available.

+ Details

Name:	pubm_LineOfCreditFacilityBorrowingCapacityPercentageOfEligibleAccountsReceivableNet
Namespace Prefix:	pubm_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Line of Credit Facility, Borrowing Capacity, Unused Capacity Fee, Closing Balance Threshold

+ References

No definition available.

+ Details

Name:	pubm_LineOfCreditFacilityBorrowingCapacityUnusedCapacityFeeClosingBalanceThreshold
Namespace Prefix:	pubm_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 1B
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=123466505&loc=SL123495323-112611

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

+ Details

Name:	us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

The fee, expressed as a percentage of the line of credit facility, for the line of credit facility regardless of whether the facility has been used.

+ References

No definition available.

+ Details

Name:	us-gaap_LineOfCreditFacilityCommitmentFeePercentage
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

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

No definition available.

+ Details

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

X

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ 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 210.5-02.19(b),22(b))
-URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

+ Details

Name:	us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility.

+ References

No definition available.

+ Details

Name:	us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_CreditFacilityAxis=us-gaap_RevolvingCreditFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DebtInstrumentAxis=pubm_CreditAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_LongtermDebtTypeAxis=us-gaap_LineOfCreditMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_VariableRateAxis=us-gaap_FederalFundsEffectiveSwapRateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_VariableRateAxis=pubm_SecuredOvernightFinancingRateSOFRMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_VariableRateAxis=pubm_AlternateBaseRateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_LongtermDebtTypeAxis=us-gaap_LetterOfCreditMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_LongtermDebtTypeAxis=pubm_SwinglineSubFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_LineOfCreditFacilityAxis=pubm_SiliconValleyBankMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: