Fair Value of Financial Instruments - Summary of Fair Values of Financial Instruments (Detail) - USD ($)	Mar. 31, 2017	Dec. 31, 2016
Financial assets carried at fair value:
Short-term investments – available for sale	$ 7,954,240	$ 10,075,058
Total financial assets	11,615,515	12,594,380
Financial liabilities carried at fair value:
Debt conversion feature - long-term	453,350
Total financial liabilities	453,350	731,048
Debt conversion feature liability, current		731,048
Money market funds [Member]
Financial assets carried at fair value:
Cash and cash equivalents, fair value disclosure	3,661,275	2,519,322
Certificates of deposit [Member]
Financial assets carried at fair value:
Short-term investments – available for sale	439,077
Corporate debt securities, available-for-sale [Member]
Financial assets carried at fair value:
Short-term investments – available for sale	7,515,163	10,075,058
Level 1 [Member]
Financial assets carried at fair value:
Total financial assets	4,100,352	2,519,322
Level 1 [Member] | Money market funds [Member]
Financial assets carried at fair value:
Cash and cash equivalents, fair value disclosure	3,661,275	2,519,322
Level 1 [Member] | Certificates of deposit [Member]
Financial assets carried at fair value:
Short-term investments – available for sale	439,077
Level 2 [Member]
Financial assets carried at fair value:
Total financial assets	7,515,163	10,075,058
Level 2 [Member] | Corporate debt securities, available-for-sale [Member]
Financial assets carried at fair value:
Short-term investments – available for sale	7,515,163	10,075,058
Level 3 [Member]
Financial liabilities carried at fair value:
Debt conversion feature - long-term	453,350
Total financial liabilities	$ 453,350	731,048
Debt conversion feature liability, current		$ 731,048