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Commitments and Contingencies (Details) - USD ($)
1 Months Ended 6 Months Ended
Feb. 05, 2016
Mar. 31, 2016
Jun. 30, 2017
Sandoz Patent Infringement Lawsuit      
Commitments      
Period of time, patent infringement suit can be filed in federal district court (in days) 45 days    
Month stay period (in months) 30 months 30 months  
Endoceutics License Agreement      
Commitments      
Period after first commercial sale (in years)     10 years
Endoceutics License Agreement | First Sales Milestone | Endoceutics, Inc.      
Commitments      
Sales milestone     $ 15,000,000.0
Sales milestone, triggering amount     150,000,000.0
Endoceutics License Agreement | Second Sales Milestone | Endoceutics, Inc.      
Commitments      
Sales milestone     30,000,000.0
Sales milestone, triggering amount     300,000,000.0
Endoceutics License Agreement | Third Sales Milestone | Endoceutics, Inc.      
Commitments      
Sales milestone     850,000,000.0
Sales milestone, triggering amount     500,000,000.0
Endoceutics License Agreement | Tiered Royalties      
Commitments      
Maximum future contingent payments     150,000,000.0
Net sales threshold, future contingent payments     $ 1,000,000,000.0
Endoceutics License Agreement | Tiered Royalties | Maximum      
Commitments      
Royalty percentage, maximum     20.00%
Palatin License Agreement | License Agreement Terms      
Commitments      
Maximum future contingent payments     $ 380,000,000.0
Palatin License Agreement | First Sales Milestone | License Agreement Terms      
Commitments      
Sales milestone     25,000,000.0
Sales milestone, triggering amount     250,000,000.0
Maximum future contingent payments     300,000,000.0
Palatin License Agreement | Regulatory milestone | License Agreement Terms      
Commitments      
Maximum future contingent payments     $ 80,000,000.0