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Significant Agreements (Details)
$ in Millions
1 Months Ended 12 Months Ended
Oct. 29, 2014
compound
Nov. 30, 2014
USD ($)
Aug. 31, 2013
USD ($)
Dec. 31, 2014
USD ($)
Research and Development Arrangement, Contract to Perform for Others [Line Items]        
Deferred revenue recognition period (in months)     70 months  
Number of compounds | compound 2      
Waterstone Licensing Agreement | Licensing Agreement        
Research and Development Arrangement, Contract to Perform for Others [Line Items]        
Milestone payment for first product registration   $ 4.0    
Option exercise period 18 months      
Contract term 10 years      
Upfront payment   1.0    
Additional upfront payment   $ 0.5    
Revenue from non-refundable upfront payment       $ 1.0
Development, License, and Supply Agreement | R-Pharm Collaboration Arrangement        
Research and Development Arrangement, Contract to Perform for Others [Line Items]        
Proceeds from collaborators     $ 1.5  
Milestone payment for first product registration     3.0  
Sales based payments     $ 15.0  
Deferred revenue recognition period (in months)     70 months