Annual report pursuant to Section 13 and 15(d)

Acquisitions - Additional Information (Detail)

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Acquisitions - Additional Information (Detail) (USD $)
Share data in Millions, unless otherwise specified
0 Months Ended 12 Months Ended
Jan. 17, 2012
Dec. 31, 2013
OncoHist [Member]
   
Business Acquisition [Line Items]    
Fair value of intangible asset   $ 10,559,820
SymbioTec GmbH [Member]
   
Business Acquisition [Line Items]    
Shares of common stock exchanged in acquisition 25.6  
Business acquisitions full consideration transferred 9,750,000  
Business acquisition, Assumption of note payable 411,000  
Business acquisition, Stock issuance costs 80774  
Business acquisition, Description   SymbioTec is principally focused on the discovery of therapies designed to treat cancer in humans. SymbioTec's lead product candidate, OncoHist, is in the pre-clinical stage of development for the treatment of refractory AML and Non-Hodgkins Lymphoma. OncoHist has been granted orphan drug status by both the U.S. Food and Drug Administration ("FDA") and the European Medicines Agency.
Forecasting period for revenue and operating projections   18 years
Discount rate used to estimate fair value of intangible asset   50.00%
Estimated cost to complete pre-clinical work for IND filing   10,000,000
SymbioTec GmbH [Member] | OncoHist [Member]
   
Business Acquisition [Line Items]    
Fair value of intangible asset $ 9,580,000