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Subsequent Events (Details) - USD ($)	Oct. 31, 2019	Oct. 29, 2019	Oct. 28, 2019	Jul. 24, 2019	Jul. 23, 2019
Merger Agreement with NeuroBo
Subsequent Events
Merger agreement, minimum parent cash amount				$ 3,400,000
License Agreement with Beijing SL
Subsequent Events
Upfront payment to be received					$ 2,500,000
Subsequent Event | Merger Agreement with NeuroBo
Subsequent Events
Merger agreement, minimum parent cash amount		$ 3,750,000,000,000	$ 3,000,000,000,000
Subsequent Event | License Agreement with Beijing SL
Subsequent Events
Upfront payment to be received	$ 2,500,000

X

- Definition

Amount of upfront payment to be received under the license agreement.

+ References

No definition available.

+ Details

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Namespace Prefix:	gemp_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

The minimum parent cash amount at closing allowable under the merger agreement.

+ References

No definition available.

+ Details

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Namespace Prefix:	gemp_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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

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

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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