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

Term of lessee's operating lease renewal, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (a)(3)
-URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918673-209980

Name:	us-gaap_LesseeOperatingLeaseRenewalTerm
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Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	instant

Term of lessee's operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

Name:	us-gaap_LesseeOperatingLeaseTermOfContract
Namespace Prefix:	us-gaap_
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Period Type:	instant

Lessee, Operating Lease, Incentive Rent Abatements.

No definition available.

Name:	zsan_LesseeOperatingLeaseIncentiveRentAbatements
Namespace Prefix:	zsan_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Lessee, Operating Lease, Tenant Improvements To be Paid By Lessor

No definition available.

Name:	zsan_LesseeOperatingLeaseTenantImprovementsTobePaidByLessor
Namespace Prefix:	zsan_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Monthly Base Rent

No definition available.