Other Current Assets - Additional Information (Detail) (USD $)	Dec. 31, 2012	Nov. 30, 2012	Dec. 31, 2012 $1.5 Million Purchase Agreement with Lincoln Park	Jan. 31, 2013 $1.5 Million Purchase Agreement with Lincoln Park Subsequent Event	Dec. 31, 2012 $15 Million Purchase Agreement with Lincoln Park	Dec. 31, 2012 ATM Agreement Third Party	Dec. 31, 2012 Purchase Agreement Other Current Assets	Feb. 28, 2013 Option and License Agreement Subsequent Event	Dec. 31, 2012 Option and License Agreement Other Current Assets
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Line Items]
Implementation cost	$ 341,166					$ 101,972	$ 216,198		$ 22,996
Purchase agreement, aggregate shares opexa has right to sell	16,500,000	16,500,000	1,500,000	1,500,000	15,000,000
Option and License Agreement, upfront payment received								$ 5,000,000