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Commitments and Contingencies (Details)
1 Months Ended 12 Months Ended
Aug. 31, 2014
USD ($)
Dec. 31, 2016
USD ($)
item
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
item
Commitments and contingencies        
Grant funds received   $ 0 $ 0  
Deferred grant revenue   833,975 841,225  
Prepaid expenses and other current assets   $ 1,830,958 1,545,917  
Requisite age requirement for 401(k) plan (in years) | item   21    
Discretionary matching contributions made by the Company   $ 0 0 $ 0
Operating lease commitments due:        
December 31, 2017   156,478    
December 31, 2018   200,082    
December 31, 2019   203,755    
December 31, 2020   85,535    
Total lease expense   101,609 77,192 $ 63,880
U.S. Federal Agency | Grant Revenue        
Commitments and contingencies        
Number of U.S. Federal agencies | item       1
Concentration, as a percent       85.00%
AARA - Transdermal Cannabinoid Prodrug Treatment for Cannabis Withdrawal and Dependence | Federal Grants        
Commitments and contingencies        
Deferred grant revenue   800,000 800,000  
Prepaid expenses and other current assets   $ 800,000 $ 800,000  
ACP | Patent Assignment Consideration Agreement | General and Administrative        
Commitments and contingencies        
Termination fee $ 500,000