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Consolidated Statements of Redeemable Convertible Preferred Stock and Stockholders' Equity (Deficit) (Parenthetical) $ in Thousands	12 Months Ended
	Dec. 31, 2015 USD ($)
Reclassification to redeemable convertible preferred stock tranche liability	$ 1,017
Series C Preferred Stock [Member]
Issuance of convertible redeemable preferred stock, net issuance costs	138
Reclassification to redeemable convertible preferred stock tranche liability	$ 1,017

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- Definition

Reclassification to redeemable convertible preferred stock tranche liability.

+ References

No definition available.

+ Details

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- Definition

Temporary equity issuance cost.

+ References

No definition available.

+ Details

Name:	ptgx_TemporaryEquityIssuanceCost
Namespace Prefix:	ptgx_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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- Details

Name:	us-gaap_StatementClassOfStockAxis=us-gaap_SeriesCPreferredStockMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: