Consolidated Statements of Changes In Stockholders' Equity (Parenthetical) (USD $) In Millions, unless otherwise specified	Jun. 30, 2013	Jan. 31, 2013
Purchase agreement, aggregate shares opexa has right to sell	$ 16.5
$1.5 Million Purchase Agreement with Lincoln Park
Purchase agreement, aggregate shares opexa has right to sell	$ 1.5	$ 1.5