Document and Entity Information (USD $)
In Millions, except Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Feb. 28, 2014
Jun. 28, 2013
Document and Entity Information      
Entity Registrant Name Onconova Therapeutics, Inc.    
Entity Central Index Key 0001130598    
Document Type 10-K    
Document Period End Date Dec. 31, 2013    
Amendment Flag false    
Current Fiscal Year End Date --12-31    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Filer Category Non-accelerated Filer    
Entity Public Float     $ 107.3
Entity Common Stock, Shares Outstanding   21,638,029  
Document Fiscal Year Focus 2013    
Document Fiscal Period Focus FY