Rendering

Component: (Network and Table)
Network
100670 - Disclosure - Income Taxes Unrecognized tax benefits (Details)
(http://www.agenusbio.com/20161231/taxonomy/role/DisclosureIncomeTaxesUnrecognizedTaxBenefitsDetails)
Table(Implied)
Slicers (applies to each fact value in each table cell)
Reporting Entity [Axis]0001098972 (http://www.sec.gov/CIK)
Income Tax Disclosure [Abstract]Period [Axis]
2016-01-01 - 2016-12-31
2015-01-01 - 2015-12-31
2014-01-01 - 2014-12-31
Income Tax Disclosure [Abstract]
 
 
 
Reconciliation of Unrecognized Tax Benefits [Roll Forward]
 
 
 
Unrecognized Tax Benefits, Beginning balance
5,481,000  
5,778,000  
5,649,000  
Increase related to current year positions
 
203,000  
90,000  
(Decrease) increase related to previously recognized positions
(203,000) 
(500,000) 
39,000  
Unrecognized Tax Benefits, Ending balance
5,278,000  
 
5,481,000  
 
5,778,000