Fair Value of Financial Instruments - Summary of Fair Values of Financial Instruments (Detail) - USD ($)	Mar. 31, 2016	Dec. 31, 2015
Financial assets carried at fair value:
Short-term investments – available for sale	$ 7,292,863	$ 13,335,499
Total financial assets	10,907,128	13,884,371
Financial liabilities carried at fair value:
Debt conversion feature – long-term	1,698,671	2,370,903
Total financial liabilities	1,698,671	2,370,903
Level 1 [Member]
Financial assets carried at fair value:
Total financial assets	8,031,262	6,400,215
Level 2 [Member]
Financial assets carried at fair value:
Total financial assets	2,875,866	7,484,156
Level 3 [Member]
Financial liabilities carried at fair value:
Debt conversion feature – long-term	1,698,671	2,370,903
Total financial liabilities	1,698,671	2,370,903
Money market funds [Member]
Financial assets carried at fair value:
Cash and cash equivalents, fair value disclosure	3,614,265	548,872
Money market funds [Member] | Level 1 [Member]
Financial assets carried at fair value:
Cash and cash equivalents, fair value disclosure	3,614,265	548,872
Certificates of deposit [Member]
Financial assets carried at fair value:
Short-term investments – available for sale	4,416,997	5,851,343
Certificates of deposit [Member] | Level 1 [Member]
Financial assets carried at fair value:
Short-term investments – available for sale	4,416,997	5,851,343
Corporate debt securities, available-for-sale [Member]
Financial assets carried at fair value:
Short-term investments – available for sale	2,875,866	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	$ 2,875,866	$ 7,484,156