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Collaborative Arrangements (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2014
Information related to collaborative arrangements      
Less: amortization of capitalized fees paid to a related party $ (3,456) $ (3,456)  
Royalty revenue 40,271 23,955  
Strategic alliance - MABA program license 221 221  
Total net revenue 40,492 24,176  
GSK      
Information related to collaborative arrangements      
Total net revenue 40,492 24,176  
Long-acting beta agonist (LABA) collaboration | GSK      
Information related to collaborative arrangements      
Royalties from a related party 43,727 27,411  
Less: amortization of capitalized fees paid to a related party (3,456) (3,456)  
Royalty revenue 40,271 23,955  
Milestone fees paid     $ 220,000
Obligation for milestone payments 0    
Long-acting beta agonist (LABA) collaboration | GSK | RELVAR/BREO      
Information related to collaborative arrangements      
Royalties from a related party $ 38,689 24,287  
Royalty rate for first level of annual global net sales (as a percent) 15.00%    
Annual global sales level used to determine royalty rate $ 3,000,000    
Royalty rate for sales above first level of annual global net sales (as a percent) 5.00%    
Long-acting beta agonist (LABA) collaboration | GSK | ANORO      
Information related to collaborative arrangements      
Royalties from a related party $ 5,038 3,124  
Long-acting beta agonist (LABA) collaboration | GSK | ANORO | Minimum      
Information related to collaborative arrangements      
Royalty rate for combination products (as a percent) 6.50%    
Long-acting beta agonist (LABA) collaboration | GSK | ANORO | Maximum      
Information related to collaborative arrangements      
Royalty rate for combination products (as a percent) 10.00%    
Strategic alliance - MABA program license | GSK      
Information related to collaborative arrangements      
Strategic alliance - MABA program license $ 221 $ 221  
Percentage of milestone payment 15.00%    
Strategic alliance - MABA program license | GSK | Maximum      
Information related to collaborative arrangements      
Potential future contingent payments receivable $ 363,000