Area of land subject to a ground lease.

No definition available.

Name:	us-gaap_LandSubjectToGroundLeases
Namespace Prefix:	us-gaap_
Data Type:	num:areaItemType
Balance Type:	na
Period Type:	instant

- Definition

Amount of rent expense incurred for leased assets, including but not limited to, furniture and equipment, that is not directly or indirectly associated with the manufacture, sale or creation of a product or product line.

+ References

No definition available.

+ Details

Name:	us-gaap_LeaseAndRentalExpense
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The amount of an asset, typically cash, provided to a counterparty to provide certain assurance of performance by the entity pursuant to the terms of a written or oral agreement, such as a lease.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.8,17)
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

+ Details

Name:	us-gaap_SecurityDeposit
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Annual base rent.

+ References

No definition available.

+ Details

Name:	ziop_AnnualBaseRent
Namespace Prefix:	ziop_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of Lessee Operating Lease Monthly Average Rental Payment .

+ References

No definition available.

+ Details

Name:	ziop_LesseeOperatingLeaseMonthlyAverageRentalPayment
Namespace Prefix:	ziop_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Lessee Operating Lease Monthly Rental Payment.

+ References

No definition available.

+ Details

Name:	ziop_LesseeOperatingLeaseMonthlyRentalPayment
Namespace Prefix:	ziop_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Operating lease area.

+ References

No definition available.

+ Details

Name:	ziop_OperatingLeaseArea
Namespace Prefix:	ziop_
Data Type:	num:areaItemType
Balance Type:	na
Period Type:	instant

- Definition

Operating leases expiration month and year.

+ References

No definition available.

+ Details

Name:	ziop_OperatingLeasesExpirationMonthAndYear
Namespace Prefix:	ziop_
Data Type:	xbrli:gYearMonthItemType
Balance Type:	na
Period Type:	duration

- Definition

Operating leases future minimum monthly payment due through year four.

+ References

No definition available.

+ Details

Name:	ziop_OperatingLeasesFutureMinimumMonthlyPaymentDueThroughYearFour
Namespace Prefix:	ziop_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Sublease term commenced end date amendment.

+ References

No definition available.

+ Details

Name:	ziop_SubleaseTermCommencedEndDateAmendment
Namespace Prefix:	ziop_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	srt_StatementGeographicalAxis=ziop_MaMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_StatementGeographicalAxis=ziop_HoustonTexasMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Leases - Additional Information (Details) $ in Thousands							3 Months Ended
Leases - Additional Information (Details) $ in Thousands	Dec. 15, 2020 USD ($) ft²	Sep. 01, 2020 USD ($)	Jun. 01, 2020 USD ($)	Apr. 13, 2020 USD ($)	Oct. 15, 2019 USD ($) ft²	Mar. 12, 2019 USD ($) ft²	Mar. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Jan. 30, 2018 USD ($) ft²
Land Subject to Ground Leases \| ft²						1,038
Operating Lease Monthly Rental Payment			$ 10			$ 2
Boston, MA
Security Deposit							$ 100	$ 100
Sublease term amendment							Aug. 31, 2021
Operating lease expiration month and year							2016-08
Houston, TX
Land Subject to Ground Leases \| ft²	35,482				8,443
Operating Lease Area \| ft²									210
Operating Leases Future Minimum Monthly Payment Due Through Year 2021	$ 37			$ 12	$ 17				$ 1
Annual Base Rent	3.00%			3.00%	3.00%
Lessee Operating Lease Monthly Rental Payment		$ 15
Operating lease rental expenses							$ 100