Rendering

Component: (Network and Table)
Network
100570 - Disclosure - Stock-based Compensation - Weighted Average Assumptions used to Determine Fair Value of Stock Awards (Detail)
(http://www.alderbio.com/20161231/taxonomy/role/DisclosureStockBasedCompensationWeightedAverageAssumptionsUsedToDetermineFairValueOfStockAwardsDetail)
TableSchedule Of Share Based Compensation Arrangements By Share Based Payment Award [Table]
Slicers (applies to each fact value in each table cell)
Reporting Entity [Axis]0001423824 (http://www.sec.gov/CIK)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]Period [Axis]
2016-01-01 - 2016-12-31
2015-01-01 - 2015-12-31
2014-01-01 - 2014-12-31
Plan NamePlan NamePlan Name
2014 Employee Stock Purchase PlanPlan Name2014 Employee Stock Purchase PlanPlan Name2014 Employee Stock Purchase PlanPlan Name
Award TypeAward TypeAward TypeAward TypeAward TypeAward Type
Equity AwardEmployee Stock OptionEquity AwardEquity AwardEmployee Stock OptionEquity AwardEmployee Stock Option
Volatility
68.00%  
60.50%  
 
57.00%  
59.50%  
59.10%  
66.10%  
Expected term (years)
P1Y4M24D  
P6Y1M6D  
 
P10M24D  
P6Y1M6D  
P7M6D  
P6Y1M6D  
Risk-free interest rate
0.80%  
1.40%  
 
0.30%  
1.60%  
0.10%  
1.90%  
Dividend rate
0.00%  
0.00%  
0.00%  
0.00%  
0.00%  
0.00%  
0.00%