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Summary of Significant Accounting Policies - Deferred Commissions (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023
Deferred Commissions [Roll Forward] |  |
Balance, beginning of the year | $ 96 | $ 136
Deferral of commissions earned | 105 | 22
Recognition of commission expense | (55) | (62)
Balance, end of the year | $ 146 | $ 96

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- Definition Capitalized Contract Cost, Increase from Deferral + References No definition available. + Details
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Balance Type: | debit
Period Type: | duration

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- Definition Deferred Commissions + References No definition available. + Details
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Namespace Prefix: | phun_
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Balance Type: | na
Period Type: | duration

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- Definition Amount of amortization expense for asset recognized from cost incurred to obtain or fulfill contract with customer. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 340 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479483/340-40-50-3 + Details
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Balance Type: | debit
Period Type: | duration

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- Definition Amount, before accumulated amortization and accumulated impairment loss, of asset recognized from cost incurred to obtain or fulfill contract with customer. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 340 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479483/340-40-50-3 + Details
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Period Type: | instant