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License Agreements (Details) - USD ($)
1 Months Ended 6 Months Ended
Nov. 30, 2012
Jun. 30, 2017
Jun. 30, 2016
License Agreements      
Period describing the commercial launch of dose   15 years  
License agreement      
License Agreements      
Upfront payment received $ 65,000,000    
Maximum total additional cash payments receivable upon achievement of certain development and regulatory milestones $ 95,000,000    
Prosecution and litigation cost   $ 0 $ 1,200,000