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Cash, Cash Equivalents, Short-Term Investments and Long-Term Investments (Details) - USD ($)
 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Dec. 31, 2014
Schedule of Cash, cash equivalents, short-term investments and long-term investments        
Cash and cash equivalents $ 3,650,699 $ 1,925,179 $ 1,573,328 $ 850,028
Short-term investments 6,696,000   4,464,000  
Subtotal 10,346,699   6,037,328  
Long-term investments 487,000   487,000  
Total 10,833,699   $ 6,524,328  
Increase in cash and cash equivalents 2,077,371 $ 1,075,151    
Increase in short-term investments [1] 2,232,000      
Increase in cash and cash equivalents and short term investments 4,309,371      
Increase in long term investments [1] 0      
Increase in cash and cash equivalents short term and long term investments $ 4,309,371      
[1] We accrued $18,481 and $9,221 in interest income on these investments as of June 30, 2016 and December 31, 2015, respectively, which was recorded in accounts receivable.