Rendering

Component: (Network and Table)
Network
100630 - Disclosure - Income Taxes - Effective Income Tax Rate Reconciliation (Detail)
(http://www.alderbio.com/20161231/taxonomy/role/DisclosureIncomeTaxesEffectiveIncomeTaxRateReconciliationDetail)
Table(Implied)
Slicers (applies to each fact value in each table cell)
Reporting Entity [Axis]0001423824 (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]
 
 
 
Federal statutory income tax rate
34.00%  
34.00%  
34.00%  
Stock-based compensation
(1.00%) 
(1.00%) 
0.90%  
Research and development credits
2.40%  
2.40%  
(13.60%) 
Other
(0.10%) 
(0.10%) 
0.90%  
Change in valuation allowance
(35.30%) 
(35.30%) 
(22.20%) 
Effective tax rate
0.00%  
 
0.00%  
 
0.00%