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Stockholders’ Equity - Dividend Rights (Details) - Common Stock	9 Months Ended
	Sep. 30, 2019 USD ($) Vote / shares
Dividends Rights
No dividends declared | $	$ 0
Voting Rights
Common stock, vote per share | Vote / shares	1

X

- Definition

Represents the voting rights per share for common stock of the entity.

+ References

No definition available.

+ Details

Name:	gemp_CommonStockVotingRightsPerShare
Namespace Prefix:	gemp_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of cumulative cash dividends declared.

+ References

No definition available.

+ Details

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

X

- References

No definition available.

+ Details

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

X

- References

No definition available.

+ Details

Name:	us-gaap_DividendsCommonStockAbstract
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: