Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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Reference 11: http://www.xbrl.org/2003/role/disclosureRef
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+ Details

BALANCE SHEET COMPONENTS - Additional Disclosures (Details) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2026 USD ($)	Jun. 30, 2026 USD ($)	Dec. 31, 2025 USD ($)
BALANCE SHEET COMPONENTS
Gain from settlement of vendor claims	$ 1,198	$ 1,198
Vendor claims
BALANCE SHEET COMPONENTS
Number of claims settled	2	2
Gain from settlement of vendor claims		$ 1,200
Vendor claims \| Location, Statement of Financial Position, Balance [Axis]: us-gaap:AccountsPayableCurrent
BALANCE SHEET COMPONENTS
Accrual for vendor claims			$ 600
Vendor claims \| Location, Statement of Financial Position, Balance [Axis]: zspc:AccruedLiabilitiesAndOtherLiabilitiesExcludingAccruedInterestCurrent
BALANCE SHEET COMPONENTS
Accrual for vendor claims			$ 600