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v3.20.1

Debt - Minimum future payment obligations including principal and final payment fee (Details) $ in Thousands | Mar. 31, 2020 USD ($)
--- | ---
Debt |
2021 | $ 833
2022 | 5,000
2023 | 4,452
Total | $ 10,285

X
- Definition The amount of long-term debt principal payable and final payment fee due. + References No definition available. + Details
Name: | ptgx_LongTermDebtAndFinalPaymentFeeDue
Namespace Prefix: | ptgx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The amount of long-term debt principal payable and final payment fee maturing in the fourth fiscal year following the latest fiscal year. + References No definition available. + Details
Name: | ptgx_LongTermDebtAndFinalPaymentFeeMaturitiesRepaymentsOfPrincipalInYearFour
Namespace Prefix: | ptgx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The amount of long-term debt principal payable and final payment fee maturing in the third fiscal year following the latest fiscal year. + References No definition available. + Details
Name: | ptgx_LongTermDebtAndFinalPaymentFeeMaturitiesRepaymentsOfPrincipalInYearThree
Namespace Prefix: | ptgx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The amount of long-term debt principal payable and final payment fee maturing in the second fiscal year following the latest fiscal year. + References No definition available. + Details
Name: | ptgx_LongTermDebtAndFinalPaymentFeeMaturitiesRepaymentsOfPrincipalInYearTwo
Namespace Prefix: | ptgx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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