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Related Party Transactions (Details)
3 Months Ended 12 Months Ended
Jan. 26, 2017
$ / shares
shares
Dec. 31, 2016
USD ($)
Aug. 29, 2016
director
$ / shares
shares
Sep. 30, 2013
USD ($)
item
shares
Mar. 31, 2017
USD ($)
Mar. 31, 2016
USD ($)
Dec. 31, 2016
USD ($)
item
Related Party Transactions              
Common stock value | $   $ 19,944,000     $ 20,296,000   $ 19,944,000
Chief Executive Officer | License Agreement with Yale              
Related Party Transactions              
Number of inventors of the patents licensed from Yale | item       1      
Common shares issued | shares       250,000      
Percent of Company's outstanding equity fully diluted       5.10%      
Common stock value | $       $ 152,000      
Payments to related party | $   $ 0     0   $ 0
Recognized research and development expenses | $         $ 0 $ 8,000  
Shareholders and members of the Board of Directors | Guarantor and Co-Guarantor Warrants | Guarantor and Co-Guarantor Warrants              
Related Party Transactions              
Common shares issued | shares 107,500            
Exercise price of warrants (per share) | $ / shares $ 9.2911            
Equity Investment | Kleo Pharmaceuticals, Inc.              
Related Party Transactions              
Shares of Kleo common stock purchased | shares     3,000,000        
Price per share | $ / shares     $ 1.00        
Additional shares of Kleo common stock purchased | shares     5,500,000        
Number to designate to Kleo's board of directors | director     2        
Shares of Kleo common stock purchased from Chief Executive Officer | shares     500,000        
Ownership percentage         27.90%    
Majority Shareholder | Biohaven Pharmaceuticals, Inc.              
Related Party Transactions              
Number of founders | item             3
Equity share percentage owned by each founders   33.33%         33.33%
Ownership interest acquired   100.00%         100.00%
Aggregate purchase consideration | $   $ 595,000.000         $ 595,000