Fair Value of Financial Instruments - Summary of Fair Values of Financial Instruments (Detail) - USD ($)	Jun. 30, 2017	Dec. 31, 2016
Financial assets carried at fair value:
Short-term investments – available for sale	$ 8,689,630	$ 10,075,058
Total financial assets	12,156,096	12,594,380
Financial liabilities carried at fair value:
Debt conversion feature - long-term	894,152
Total financial liabilities	894,152	731,048
Debt conversion feature liability, current	894,152	731,048
Level 1 [Member]
Financial assets carried at fair value:
Total financial assets	3,656,246	2,519,322
Level 2 [Member]
Financial assets carried at fair value:
Total financial assets	8,499,850	10,075,058
Level 3 [Member]
Financial liabilities carried at fair value:
Debt conversion feature - long-term	894,152
Total financial liabilities	894,152	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	2,966,071	2,519,322
Money market funds [Member] | Level 1 [Member]
Financial assets carried at fair value:
Cash and cash equivalents, fair value disclosure	2,966,071	2,519,322
Certificates of deposit [Member]
Financial assets carried at fair value:
Cash and cash equivalents, fair value disclosure	500,395
Short-term investments – available for sale	189,780
Certificates of deposit [Member] | Level 1 [Member]
Financial assets carried at fair value:
Cash and cash equivalents, fair value disclosure	500,395
Short-term investments – available for sale	189,780
Corporate debt securities, available-for-sale [Member]
Financial assets carried at fair value:
Short-term investments – available for sale	8,499,850	10,075,058
Corporate debt securities, available-for-sale [Member] | Level 2 [Member]
Financial assets carried at fair value:
Short-term investments – available for sale	$ 8,499,850	$ 10,075,058