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Warrants - Additional Information (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Mar. 31, 2014
Dec. 31, 2009
Mar. 31, 2015
Class of Warrant or Right [Line Items]      
Warrants to purchase an aggregate of shares of common stock   8,206,520ziop_WarrantsToPurchaseAggregateSharesOfCommonStock  
Warrant term   5 years  
Change in fair value of warrants $ 82us-gaap_UnrealizedGainLossOnDerivatives    
Warrants exercised 0ziop_ClassOfWarrantOrRightExercisedInPeriod    
Warrants outstanding     0us-gaap_ClassOfWarrantOrRightOutstanding
J. P. Morgan Securities LLC      
Class of Warrant or Right [Line Items]      
Warrants issued   464,520ziop_WarrantsIssuedInInitialPublicOffering
/ us-gaap_ClassOfWarrantOrRightAxis
= ziop_UnderwriterMember		  
Warrant exercisable Period   6 months