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Fair Value of Financial Instruments - Summary of Fair Values of Financial Instruments (Detail) - USD ($)
Sep. 30, 2016
Dec. 31, 2015
Financial assets carried at fair value:    
Short-term investments – available for sale $ 11,562,950 $ 13,335,499
Total financial assets 13,573,619 13,884,371
Financial liabilities carried at fair value:    
Debt conversion feature - current 1,351,135  
Total financial liabilities 1,351,135 2,370,903
Debt conversion feature - long-term   2,370,903
Level 1 [Member]    
Financial assets carried at fair value:    
Total financial assets 2,260,017 6,400,215
Level 2 [Member]    
Financial assets carried at fair value:    
Total financial assets 11,313,602 7,484,156
Level 3 [Member]    
Financial liabilities carried at fair value:    
Debt conversion feature - current 1,351,135  
Total financial liabilities 1,351,135 2,370,903
Debt conversion feature - long-term   2,370,903
Money market funds [Member]    
Financial assets carried at fair value:    
Cash and cash equivalents, fair value disclosure 2,010,669 548,872
Money market funds [Member] | Level 1 [Member]    
Financial assets carried at fair value:    
Cash and cash equivalents, fair value disclosure 2,010,669 548,872
Certificates of deposit [Member]    
Financial assets carried at fair value:    
Short-term investments – available for sale 249,348 5,851,343
Certificates of deposit [Member] | Level 1 [Member]    
Financial assets carried at fair value:    
Short-term investments – available for sale 249,348 5,851,343
Corporate debt securities, available-for-sale [Member]    
Financial assets carried at fair value:    
Short-term investments – available for sale 11,313,602 7,484,156
Corporate debt securities, available-for-sale [Member] | Level 2 [Member]    
Financial assets carried at fair value:    
Short-term investments – available for sale $ 11,313,602 $ 7,484,156