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Share-Based Compensation - Innoviva’s Equity Plans (Details) - plan
Sep. 25, 2015
Jun. 02, 2014
Share-Based Compensation    
Number of plans   3
Vesting period 3 years  
2012 Equity Incentive Plan    
Share-Based Compensation    
Number of plans   1
2012 Equity Incentive Plan | Options    
Share-Based Compensation    
Term (in years)   10 years
Vesting period   4 years
Period of forfeiture of unvested option upon termination of service   3 months
Vesting after one year | 2012 Equity Incentive Plan | Options    
Share-Based Compensation    
Vesting of RSU (as a percent)   25.00%
Monthly vesting over the remaining three years | 2012 Equity Incentive Plan | Options    
Share-Based Compensation    
Vesting of RSU (as a percent)   75.00%