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Subsequent Events - Additional Information (Detail)	1 Months Ended	3 Months Ended	12 Months Ended
	Apr. 30, 2019 Service_Provider shares	Mar. 31, 2019 shares	Dec. 31, 2018 shares
Subsequent Event [Line Items]
Issuance of stock for services, shares		121,617	200,009
Subsequent Event | Consideration of Service
Subsequent Event [Line Items]
Issuance of stock for services, shares	40,000
Number of service providers | Service_Provider	2

X

- Definition

Number Of Service Providers.

+ References

No definition available.

+ Details

Name:	gnpx_NumberOfServiceProviders
Namespace Prefix:	gnpx_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Number of shares issued in lieu of cash for services contributed to the entity. Number of shares includes, but is not limited to, shares issued for services contributed by vendors and founders.

+ References

No definition available.

+ Details

Name:	us-gaap_StockIssuedDuringPeriodSharesIssuedForServices
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

+ References

No definition available.

+ Details

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

X

- Details

Name:	us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_SubsidiarySaleOfStockAxis=gnpx_ConsiderationOfServiceMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: