Other Long Term Assets - Additional Information (Detail) (USD $)	Dec. 31, 2013	Sep. 24, 2013	Dec. 31, 2012	Nov. 30, 2012	Jan. 31, 2013 $1.5 Million Purchase Agreement with Lincoln Park	Dec. 31, 2012 $1.5 Million Purchase Agreement with Lincoln Park	Dec. 31, 2013 Purchase Agreements	Dec. 31, 2012 Purchase Agreements	Dec. 31, 2013 Other Long-term Assets	Dec. 31, 2013 Other Long-term Assets $1.5 Million Purchase Agreement with Lincoln Park
Other Noncurrent Assets [Line Items]
Purchase agreement, aggregate shares opexa has right to sell				$ 16,500,000	$ 1,500,000	$ 1,500,000	$ 1,500,000			$ 15,000,000
Deferred financing cost, non current		86,231	211,479				103,636
Deferred financing cost	$ 134,518		$ 341,166					$ 79,732	$ 74,030