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Investments (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Dec. 31, 2014
Investments            
Charges for other-than-temporary investments of short-term and long-term investments $ 0 $ 0 $ 0 $ 0    
Unrealized (gains)/losses on investments 0 3,430 (971) (5,849)    
Cash, cash equivalents and investments            
Cash and cash equivalents, Amortized Cost 8,675,724 $ 12,438,166 8,675,724 $ 12,438,166 $ 15,302,382 $ 13,073,137
Short-term investments            
Cash, cash equivalents and investments            
Investments, Amortized Cost         5,107,598  
Investments, Gross Unrealized Gains         98  
Investments, Gross Unrealized Losses         (1,069)  
Investments, Fair Value         5,106,627  
Short-term investments | Corporate bonds            
Cash, cash equivalents and investments            
Investments, Amortized Cost         3,108,516  
Investments, Gross Unrealized Losses         (1,069)  
Investments, Fair Value         3,107,447  
Short-term investments | Commercial paper            
Cash, cash equivalents and investments            
Investments, Amortized Cost         1,999,082  
Investments, Gross Unrealized Gains         98  
Investments, Fair Value         1,999,180  
Cash, Cash Equivalents and Investments            
Cash, cash equivalents and investments            
Investments, Amortized Cost         20,409,980  
Investments, Gross Unrealized Gains         98  
Investments, Gross Unrealized Losses         (1,069)  
Investments, Fair Value         20,409,009  
Cash and money market accounts            
Cash, cash equivalents and investments            
Cash and cash equivalents, Amortized Cost 8,675,724   8,675,724   15,302,382  
Cash and cash equivalents, Fair Value         15,302,382  
Investments, Fair Value 8,675,724   8,675,724      
Cash and cash equivalents            
Cash, cash equivalents and investments            
Cash and cash equivalents, Amortized Cost 8,675,724   8,675,724   15,302,382  
Cash and cash equivalents, Fair Value         $ 15,302,382  
Investments, Fair Value $ 8,675,724   $ 8,675,724