Collaborative Agreements: (Details Textual) - USD ($)
1 Months Ended 6 Months Ended 12 Months Ended
Nov. 11, 2015
Oct. 09, 2015
May 15, 2014
Mar. 31, 2015
Nov. 19, 2014
Jun. 30, 2016
Jun. 30, 2014
Dec. 31, 2015
Dec. 31, 2014
Collaborative Agreements [Line Items]                  
Estimated Budget For Services   $ 11,600,000              
Payments for Advance to Affiliate $ 1,875,861 $ 200,000              
Service Fees 928,000                
Pass Through Expenses 268,000                
Investigator And Institute fees 680,000                
Research and Development Expense [Member]                  
Collaborative Agreements [Line Items]                  
Percentage of Expenses of Total Amount Due           75.00%      
January 2016 through September 2017 [Member]                  
Collaborative Agreements [Line Items]                  
Estimated Budget For Services $ 9,500,000                
Contract Research Organization [Member]                  
Collaborative Agreements [Line Items]                  
Commitment To Pay Fees     $ 715,159     $ 150,000      
Reduction Of Commitment Fees         $ 657,238        
Payments for Fees           837,112   $ 687,112  
Accounts Payable           0   377,225 $ 417,877
Worldwide Clinical Trials [Member]                  
Collaborative Agreements [Line Items]                  
Professional Fees       $ 300,000          
Prepaid Expense           533,000      
Stanford Agreement [Member]                  
Collaborative Agreements [Line Items]                  
License Initiation Fee                 60,850
Annual License Maintenance Fee           10,000   10,000 10,000
Milestone Payments Upon Achievement Of Certain Product                 3,700,000
Payment For License Agreement Fees             $ 48,564    
Mount Sinai Agreement [Member]                  
Collaborative Agreements [Line Items]                  
License Initiation Fee           $ 29,400   25,000 $ 25,000
Annual License Maintenance Fee               10,000  
Milestone Payments Upon Achievement Of Certain Product               $ 3,500,000