XML 68 R46.htm IDEA: XBRL DOCUMENT
v3.7.0.1

Government Programs - Additional Information (Detail) | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2016 USD ($) | Dec. 31, 2016 AUD | Oct. 31, 2016 USD ($) | Oct. 31, 2016 AUD | Jul. 31, 2016 USD ($) | Sep. 30, 2015 USD ($) | Mar. 31, 2016 USD ($) | Mar. 31, 2016 AUD | Dec. 31, 2016 USD ($) | Dec. 31, 2016 AUD | Dec. 31, 2015 USD ($) | Dec. 31, 2015 AUD | Dec. 31, 2014 USD ($) | Dec. 31, 2014 AUD | Dec. 31, 2016 AUD | Dec. 31, 2015 AUD
Government Programs [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Research and development tax incentive receivable | $ 2,241,000 |  |  |  |  |  |  |  | $ 2,241,000 |  | $ 715,000 |  |  |  |  |
Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Government Programs [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Research and development tax incentives | AUD |  |  |  |  |  |  |  |  |  | AUD 20,000,000 |  |  |  |  |  |
Tax incentive rate related to research and development |  |  |  |  |  |  |  |  | 50.00% | 50.00% |  |  |  |  |  |
SBIR Grant [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Government Programs [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reduction of research and development expenses related to tax |  |  |  |  |  |  |  |  | $ 169,000 |  | 155,000 |  |  |  |  |
Research and development grants |  |  |  |  | $ 219,000 | $ 224,000 |  |  |  |  |  |  |  |  |  |
Grants receivable | $ 100,000 |  |  |  |  |  |  |  | 100,000 |  | 155,000 |  |  |  |  |
Australian Taxation Office [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Government Programs [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Research and development tax incentives |  |  | $ 2,200,000 | AUD 3,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Australian Taxation Office [Member] | Research and Development Tax Incentive Receivable [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Government Programs [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Research and development tax incentives |  |  | 700,000 | 1,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Australian Taxation Office [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Government Programs [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tax incentive rate related to research and development | 50.00% | 50.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Overseas Findings [Member] | Australian Taxation Office [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Government Programs [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Research and development tax incentive receivable | $ 2,200,000 |  |  |  |  |  |  |  | 2,200,000 |  | 715,000 |  |  |  | AUD 3,100,000 | AUD 978,000
Deferred tax incentive |  |  | $ 1,500,000 | AUD 2,000,000 |  |  | $ 182,000 | AUD 237,000 |  |  |  |  |  |  |  |
Research and Development Tax Incentive [Member] | Australian Taxation Office [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Government Programs [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reduction of research and development expenses related to tax | $ 1,600,000 | AUD 2,200,000 |  |  |  |  |  |  | $ 4,000,000 | AUD 5,300,000 | $ 736,000 | AUD 978,000 | $ 577,000 | AUD 639,000 |  |

X
- Definition Deferred tax incentive. + References No definition available. + Details
Name: | ptgx_DeferredTaxIncentive
Namespace Prefix: | ptgx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Government programs. + References No definition available. + Details
Name: | ptgx_GovernmentProgramsLineItems
Namespace Prefix: | ptgx_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage required for research and development expenses incurred to not be subject to clawback. + References No definition available. + Details
Name: | ptgx_PercentageRequiredForResearchAndDevelopmentExpensesIncurredToNotBeSubjectToClawback
Namespace Prefix: | ptgx_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Reduction of research and development expenses. + References No definition available. + Details
Name: | ptgx_ResearchAndDevelopmentExpensesReduction
Namespace Prefix: | ptgx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Research and development grants awarded during the period. + References No definition available. + Details
Name: | ptgx_ResearchAndDevelopmentGrants
Namespace Prefix: | ptgx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Research and development tax incentive receivable. + References No definition available. + Details
Name: | ptgx_ResearchAndDevelopmentTaxIncentiveReceivable
Namespace Prefix: | ptgx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Tax incentive research and development activities. + References No definition available. + Details
Name: | ptgx_TaxIncentiveResearchAndDevelopmentActivities
Namespace Prefix: | ptgx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Carrying amount as of the balance sheet date of amounts due under the terms of governmental, corporate, or foundation grants. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.8) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_GrantsReceivable
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_HealthCareOrganizationRevenueSourcesAxis=ptgx_SmallBusinessInnovationResearchGrantMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_IncomeTaxAuthorityNameAxis=us-gaap_AustralianTaxationOfficeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis=ptgx_ResearchAndDevelopmentTaxIncentiveReceivableMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_IncomeTaxAuthorityAxis=ptgx_OverseasFindingsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_TaxCreditCarryforwardAxis=us-gaap_ResearchMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |