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Stockholders' Equity (Deficit) - Summary of Warrant Issuances (Details)	6 Months Ended
	Jun. 30, 2018 $ / shares shares
Equity [Abstract]
Number of Warrants Outstanding, Beginning | shares	3,826,658
Number of Warrants Outstanding, Granted | shares
Number of Warrants Outstanding, Ending | shares	3,826,658
Number of Warrants Outstanding, Weighted Average Exercise Price, Beginning | $ / shares	$ 1.05
Number of Warrants Outstanding, Weighted Average Exercise Price, Granted | $ / shares
Number of Warrants Outstanding, Weighted Average Exercise Price, Ending | $ / shares	$ 1.05
Number of Warrants Outstanding, Weighted Average Remaining Life	4 years 8 months 9 days
Number of Warrants Exercisable, Weighted Average Remaining life	4 years 2 months 8 days

X

- Definition

The weighted average remaining contractual term for warrants or rights that are exercisable.

+ References

No definition available.

+ Details

Name:	PTIX_ClassOfWarrantOrRightExercisableWeightedAverageRemainingContractualTerm
Namespace Prefix:	PTIX_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Number of warrants outstanding, granted.

+ References

No definition available.

+ Details

Name:	PTIX_ClassOfWarrantOrRightGranted
Namespace Prefix:	PTIX_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Number of warrants outstanding, weighted average exercise price, granted.

+ References

No definition available.

+ Details

Name:	PTIX_ClassOfWarrantOrRightGrantedWeightedAverageExercisePrice
Namespace Prefix:	PTIX_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Weighted average price at which grantees can acquire the shares reserved for issuance under the warrant or right plan.

+ References

No definition available.

+ Details

Name:	PTIX_ClassOfWarrantOrRightOutstandingWeightedAverageExercisePrice
Namespace Prefix:	PTIX_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Weighted average remaining contractual term for warrants or rights.

+ References

No definition available.

+ Details

Name:	PTIX_ClassOfWarrantOrRightWeightedAverageRemainingContractualTerm
Namespace Prefix:	PTIX_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Number of warrants or rights outstanding.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(i))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

+ Details

Name:	us-gaap_ClassOfWarrantOrRightOutstanding
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

X

- References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration