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Consolidated Statements of Stockholders' Equity (Parenthetical) $ in Thousands | 12 Months Ended
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Dec. 31, 2023 USD ($)
Statement of Stockholders' Equity [Abstract] |
Prepaid expense | $ 1,024

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- Definition Prepaid Share-Based Compensation Expense + References No definition available. + Details
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Namespace Prefix: | prph_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration