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154 - Disclosure - Income Taxes - Components of Deferred Tax Assets (Detail)
(http://www.cymabay.com/taxonomy/role/DisclosureIncomeTaxesComponentsOfDeferredTaxAssets)
Table(Implied)
Slicers (applies to each fact value in each table cell)
Reporting Entity [Axis]0001042074 (http://www.sec.gov/CIK)
Income Tax Disclosure [Abstract]Period [Axis]
2016-12-31
2015-12-31
Income Tax Disclosure [Abstract]
 
 
Deferred tax assets:
 
 
Federal and state net operating loss carryforwards
88,111,000  
79,966,000  
Capitalized research and development
22,272,000  
22,287,000  
Federal and state tax credit carryforwards
8,141,000  
7,571,000  
Stock based compensation
2,080,000  
1,384,000  
Other
974,000  
628,000  
Total deferred tax assets
121,578,000  
 
111,836,000  
 
Valuation allowance
(121,578,000) 
(111,836,000) 
Net deferred tax assets
0  
 
0