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License Agreement (Details) - USD ($)
3 Months Ended
Mar. 31, 2015
Mar. 31, 2018
License Agreements    
Issuance of stock (in shares)   3,592,858
Issuance of common stock from private placement   $ 25,150,000
Common Stock    
License Agreements    
Issuance of stock (in shares)   3,592,858
Issuance of common stock from private placement   $ 4,000
Pfizer, Inc. | License Agreement    
License Agreements    
Percentage of shares of common stock offering issued to Pfizer 15.00%  
Pfizer, Inc. | License Agreement | Common Stock    
License Agreements    
Issuance of stock (in shares) 675,250  
Issuance of common stock from private placement $ 900,000  
Pfizer, Inc. | License Agreement | Common Stock | Minimum    
License Agreements    
Ownership by Pfizer 5.00%  
Pfizer, Inc. | License Agreement | Milestone Payments    
License Agreements    
Potential payments upon achievement of certain milestones   $ 0
Pfizer, Inc. | License Agreement | Milestone Payments | Maximum    
License Agreements    
Potential payments upon achievement of certain milestones $ 37,000,000