XML 62 R42.htm IDEA: XBRL DOCUMENT
v3.21.2

Cash Equivalents and Marketable Securities - Cash Equivalents and Marketable Securities (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Cash Equivalents and Marketable Securities |  |
Total cash equivalents and marketable securities, Amortized Cost | $ 348,019 | $ 304,142
Total cash equivalents and marketable securities, Gross Unrealized Gains | 6 | 12
Total cash equivalents and marketable securities, Gross Unrealized Losses | (29) | (10)
Total cash equivalents and marketable securities, Fair Value | 347,996 | 304,144
U.S. Treasury and agency securities |  |
Cash Equivalents and Marketable Securities |  |
Total cash equivalents and marketable securities, Amortized Cost | 42,186 | 183,203
Total cash equivalents and marketable securities, Gross Unrealized Gains | 3 | 10
Total cash equivalents and marketable securities, Gross Unrealized Losses | (2) | (3)
Total cash equivalents and marketable securities, Fair Value | 42,187 | 183,210
Corporate debt securities |  |
Cash Equivalents and Marketable Securities |  |
Total cash equivalents and marketable securities, Amortized Cost | 81,413 | 27,592
Total cash equivalents and marketable securities, Gross Unrealized Gains | 1 | 2
Total cash equivalents and marketable securities, Gross Unrealized Losses | (22) | (4)
Total cash equivalents and marketable securities, Fair Value | 81,392 | 27,590
Supranational and sovereign government securities |  |
Cash Equivalents and Marketable Securities |  |
Total cash equivalents and marketable securities, Amortized Cost | 6,028 |
Total cash equivalents and marketable securities, Fair Value | 6,028 |
Money Market Funds |  |
Cash Equivalents and Marketable Securities |  |
Total cash equivalents and marketable securities, Amortized Cost | 57,077 | 27,481
Total cash equivalents and marketable securities, Fair Value | 57,077 | 27,481
Commercial Paper |  |
Cash Equivalents and Marketable Securities |  |
Total cash equivalents and marketable securities, Amortized Cost | 161,315 | 65,866
Total cash equivalents and marketable securities, Gross Unrealized Gains | 2 |
Total cash equivalents and marketable securities, Gross Unrealized Losses | (5) | (3)
Total cash equivalents and marketable securities, Fair Value | $ 161,312 | $ 65,863

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | ptgx_CashEquivalentsAndAvailableForSaleSecuritiesLineItems
Namespace Prefix: | ptgx_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition This item represents the cost of debt and equity securities, including cash equivalents which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. + References No definition available. + Details
Name: | ptgx_CashEquivalentsAndMarketableSecuritiesAmortizedCost
Namespace Prefix: | ptgx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The aggregate fair value of amount of investment in debt and equity securities and cash equivalents categorized neither as held-to-maturity nor trading. + References No definition available. + Details
Name: | ptgx_CashEquivalentsAndMarketableSecuritiesFairValue
Namespace Prefix: | ptgx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of unrealized gain before deducting unrealized loss on investments in debt and equity securities classified as cash equivalents and marketable securities. + References No definition available. + Details
Name: | ptgx_CashEquivalentsAndMarketableSecuritiesGrossUnrealizedGain
Namespace Prefix: | ptgx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of unrealized loss before deducting unrealized gain on investments in cash equivalents and marketable securities. + References No definition available. + Details
Name: | ptgx_CashEquivalentsAndMarketableSecuritiesGrossUnrealizedLoss
Namespace Prefix: | ptgx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | us-gaap_InvestmentTypeAxis=ptgx_UsTreasuryAndAgencySecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InvestmentTypeAxis=us-gaap_CorporateDebtSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InvestmentTypeAxis=ptgx_SupranationalAndSovereignGovernmentSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_CashAndCashEquivalentsAxis=us-gaap_MoneyMarketFundsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_CashAndCashEquivalentsAxis=us-gaap_CommercialPaperMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |