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Research Collaboration and License Agreement (Details) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2021 USD ($) | Sep. 30, 2020 USD ($) | Sep. 30, 2021 USD ($) | Sep. 30, 2020 USD ($) | Dec. 31, 2014 USD ($) payment
Research Collaboration and License Agreement |  |  |  |  |
Number of development milestone payments | payment |  |  |  |  | 3
Aggregate development milestone payment | $ | $ 4.0 | $ 0.0 | $ 4.0 | $ 0.0 | $ 1.0

X
- Definition The aggregate amount of development milestone payment made by the entity. + References No definition available. + Details
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Namespace Prefix: | ptgx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition The number of development milestone payments in collaboration agreement. + References No definition available. + Details
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Namespace Prefix: | ptgx_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
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Namespace Prefix: | ptgx_
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Balance Type: | na
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