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Debt - Summary of Change in Fair Value of Warrant Liability (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021
Warrant Liability [Roll Forward] |  |
Balance, beginning of period | $ 3,605 | $ 1,614
Warrant issued | 0 | 0
Warrant Exercised | 0 | (16,148)
Change in fair value of warrant liability | (3,349) | 18,139
Balance, end of period | $ 256 | $ 3,605

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- Definition Exercise of Warrants and Rights + References No definition available. + Details
Name: | phun_ExerciseOfWarrantsAndRights
Namespace Prefix: | phun_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Warrant Liability + References No definition available. + Details
Name: | phun_WarrantLiabilityRollForward
Namespace Prefix: | phun_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Warrants and Rights Issued + References No definition available. + Details
Name: | phun_WarrantsAndRightsIssued
Namespace Prefix: | phun_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Amount of expense (income) related to adjustment to fair value of warrant liability. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 480 -SubTopic 10 -Section 25 -Paragraph 13 -URI https://asc.fasb.org/extlink&oid=109262497&loc=d3e20148-110875 + Details
Name: | us-gaap_FairValueAdjustmentOfWarrants
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Value of outstanding derivative securities that permit the holder the right to purchase securities (usually equity) from the issuer at a specified price. + References No definition available. + Details
Name: | us-gaap_WarrantsAndRightsOutstanding
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant