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STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (Parenthetical) $ in Millions | 9 Months Ended
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Sep. 30, 2020 USD ($)
Market Offering [Member] |
Issuance of common stock, commissions and expenses | $ 0.4
Public Offering [Member] |
Issuance of common stock, commissions and expenses | $ 5.9

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- Definition Common stock issuance cost. + References No definition available. + Details
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Namespace Prefix: | ziop_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_StatementEquityComponentsAxis=ziop_PublicOfferingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |