2.4.0.8134 - Disclosure - Stock-Based Compensation/Options and Warrants (Tables)truefalsefalse1false falsefalseeol_PE10315---13S-1-0008_STD_90_20130331_0http://www.sec.gov/CIK0001069308duration2013-01-01T00:00:002013-03-31T00:00:002false falsefalseeol_PE10315---13S-1-0008_STD_366_20121231_0http://www.sec.gov/CIK0001069308duration2012-01-01T00:00:002012-12-31T00:00:001false 4opxa_ScheduleOfStockOptionAndWarrantsActivityTableTextBlockopxa_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00<div> Summary information regarding options and warrants from December 31, 2006 is as follows:   <table style="BORDER-COLLAPSE: collapse" border="0" cellspacing="0" cellpadding="0" width="92%" align="center"> <tr> <td width="67%"></td> <td valign="bottom" width="3%"></td> <td></td> <td></td> <td></td> <td valign="bottom" width="3%"></td> <td></td> <td></td> <td></td> <td valign="bottom" width="3%"></td> <td></td> <td></td> <td></td> <td valign="bottom" width="3%"></td> <td></td> <td></td> <td></td> </tr> <tr> <td valign="bottom"> </td> <td valign="bottom">  </td> <td style="BORDER-BOTTOM: #000000 1px solid" valign="bottom" colspan="2" align="center">Options</td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td style="BORDER-BOTTOM: #000000 1px solid" valign="bottom" colspan="2" align="center">Weighted Average Exercise Price</td> <td valign="bottom"> </td> <td valign="bottom">  </td> <td style="BORDER-BOTTOM: #000000 1px solid" valign="bottom" colspan="2" align="center">Warrants</td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td style="BORDER-BOTTOM: #000000 1px solid" valign="bottom" colspan="2" align="center">Weighted Average Exercise Price</td> <td valign="bottom"> </td> </tr> <tr bgcolor="#CCEEFF"> <td valign="top"> Outstanding at December 31, 2006 </td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom" align="right">190,426</td> <td valign="bottom" nowrap="nowrap">  </td> <td valign="bottom"> </td> <td valign="bottom">$</td> <td valign="bottom" align="right">45.92</td> <td valign="bottom" nowrap="nowrap">  </td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom" align="right">917,590</td> <td valign="bottom" nowrap="nowrap">  </td> <td valign="bottom"> </td> <td valign="bottom">$</td> <td valign="bottom" align="right">78.04</td> <td valign="bottom" nowrap="nowrap">  </td> </tr> <tr> <td valign="top"> Year ended December 31, 2007: </td> <td valign="bottom">  </td> <td valign="bottom"></td> <td valign="bottom"></td> <td valign="bottom"></td> <td valign="bottom"> </td> <td valign="bottom"></td> <td valign="bottom"></td> <td valign="bottom"></td> <td valign="bottom">  </td> <td valign="bottom"></td> <td valign="bottom"></td> <td valign="bottom"></td> <td valign="bottom"> </td> <td valign="bottom"></td> <td valign="bottom"></td> <td valign="bottom"></td> </tr> <tr bgcolor="#CCEEFF"> <td valign="top"> Granted </td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom" align="right">73,475</td> <td valign="bottom" nowrap="nowrap">  </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" align="right">21.12</td> <td valign="bottom" nowrap="nowrap">  </td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom" align="right">—  </td> <td valign="bottom" nowrap="nowrap"> </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" align="right">—  </td> <td valign="bottom" nowrap="nowrap">  </td> </tr> <tr> <td valign="top"> Forfeited and canceled </td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom" align="right">(4,336</td> <td valign="bottom" nowrap="nowrap">) </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" align="right">30.96</td> <td valign="bottom" nowrap="nowrap">  </td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom" align="right">—  </td> <td valign="bottom" nowrap="nowrap">  </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" align="right">—  </td> <td valign="bottom" nowrap="nowrap">  </td> </tr> <tr style="FONT-SIZE: 1px"> <td valign="bottom"></td> <td valign="bottom">  </td> <td valign="bottom">   </td> <td valign="bottom">   </td> <td> </td> <td valign="bottom"> </td> <td valign="bottom">   </td> <td valign="bottom">   </td> <td> </td> <td valign="bottom">  </td> <td valign="bottom">   </td> <td valign="bottom">   </td> <td> </td> <td valign="bottom"> </td> <td valign="bottom">   </td> <td valign="bottom">   </td> <td> </td> </tr> <tr bgcolor="#CCEEFF"> <td valign="top"> Outstanding at December 31, 2007 </td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom" align="right">259,565</td> <td valign="bottom" nowrap="nowrap">  </td> <td valign="bottom"> </td> <td valign="bottom">$</td> <td valign="bottom" align="right">39.16</td> <td valign="bottom" nowrap="nowrap">  </td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom" align="right">917,590</td> <td valign="bottom" nowrap="nowrap">  </td> <td valign="bottom"> </td> <td valign="bottom">$</td> <td valign="bottom" align="right">78.04</td> <td valign="bottom" nowrap="nowrap">  </td> </tr> <tr> <td valign="top"> Year ended December 31, 2008: </td> <td valign="bottom">  </td> <td valign="bottom"></td> <td valign="bottom"></td> <td valign="bottom"></td> <td valign="bottom"> </td> <td valign="bottom"></td> <td valign="bottom"></td> <td valign="bottom"></td> <td valign="bottom">  </td> <td valign="bottom"></td> <td valign="bottom"></td> <td valign="bottom"></td> <td valign="bottom"> </td> <td valign="bottom"></td> <td valign="bottom"></td> <td valign="bottom"></td> </tr> <tr bgcolor="#CCEEFF"> <td valign="top"> Granted </td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom" align="right">160,100</td> <td valign="bottom" nowrap="nowrap">  </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" align="right">4.50</td> <td valign="bottom" nowrap="nowrap">  </td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom" align="right">1,682,209</td> <td valign="bottom" nowrap="nowrap">  </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" align="right">7.84</td> <td valign="bottom" nowrap="nowrap">  </td> </tr> <tr> <td valign="top"> Forfeited and canceled </td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom" align="right">(31,617</td> <td valign="bottom" nowrap="nowrap">) </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" align="right">24.41</td> <td valign="bottom" nowrap="nowrap">  </td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom" align="right">—  </td> <td valign="bottom" nowrap="nowrap">  </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" align="right">—  </td> <td valign="bottom" nowrap="nowrap">  </td> </tr> <tr style="FONT-SIZE: 1px"> <td valign="bottom"></td> <td valign="bottom">  </td> <td valign="bottom">   </td> <td valign="bottom">   </td> <td> </td> <td valign="bottom"> </td> <td valign="bottom">   </td> <td valign="bottom">   </td> <td> </td> <td valign="bottom">  </td> <td valign="bottom">   </td> <td valign="bottom">   </td> <td> </td> <td valign="bottom"> </td> <td valign="bottom">   </td> <td valign="bottom">   </td> <td> </td> </tr> <tr bgcolor="#CCEEFF"> <td valign="top"> Outstanding at December 31, 2008 </td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom" align="right">388,048</td> <td valign="bottom" nowrap="nowrap">  </td> <td valign="bottom"> </td> <td valign="bottom">$</td> <td valign="bottom" align="right">25.88</td> <td valign="bottom" nowrap="nowrap">  </td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom" align="right">2,599,799</td> <td valign="bottom" nowrap="nowrap">  </td> <td valign="bottom"> </td> <td valign="bottom">$</td> <td valign="bottom" align="right">32.60</td> <td valign="bottom" nowrap="nowrap">  </td> </tr> <tr> <td valign="top"> Year ended December 31, 2009: </td> <td valign="bottom">  </td> <td valign="bottom"></td> <td valign="bottom"></td> <td valign="bottom"></td> <td valign="bottom"> </td> <td valign="bottom"></td> <td valign="bottom"></td> <td valign="bottom"></td> <td valign="bottom">  </td> <td valign="bottom"></td> <td valign="bottom"></td> <td valign="bottom"></td> <td valign="bottom"> </td> <td valign="bottom"></td> <td valign="bottom"></td> <td valign="bottom"></td> </tr> <tr bgcolor="#CCEEFF"> <td valign="top"> Granted </td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom" align="right">193,583</td> <td valign="bottom" nowrap="nowrap">  </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" align="right">3.83</td> <td valign="bottom" nowrap="nowrap">  </td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom" align="right">801,143</td> <td valign="bottom" nowrap="nowrap">  </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" align="right">6.68</td> <td valign="bottom" nowrap="nowrap">  </td> </tr> <tr> <td valign="top"> Exercised </td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom" align="right">(15,193</td> <td valign="bottom" nowrap="nowrap">) </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" align="right">4.21</td> <td valign="bottom" nowrap="nowrap">  </td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom" align="right">(179,691</td> <td valign="bottom" nowrap="nowrap">) </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" align="right">6.64</td> <td valign="bottom" nowrap="nowrap">  </td> </tr> <tr bgcolor="#CCEEFF"> <td valign="top"> Forfeited and canceled </td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom" align="right">(85,605</td> <td valign="bottom" nowrap="nowrap">) </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" align="right">42.22</td> <td valign="bottom" nowrap="nowrap">  </td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom" align="right">(52,082</td> <td valign="bottom" nowrap="nowrap">) </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" align="right">20.00</td> <td valign="bottom" nowrap="nowrap">  </td> </tr> <tr style="FONT-SIZE: 1px"> <td valign="bottom"></td> <td valign="bottom">  </td> <td valign="bottom">   </td> <td valign="bottom">   </td> <td> </td> <td valign="bottom"> </td> <td valign="bottom">   </td> <td valign="bottom">   </td> <td> </td> <td valign="bottom">  </td> <td valign="bottom">   </td> <td valign="bottom">   </td> <td> </td> <td valign="bottom"> </td> <td valign="bottom">   </td> <td valign="bottom">   </td> <td> </td> </tr> <tr> <td valign="top"> Outstanding at December 31, 2009 </td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom" align="right">480,833</td> <td valign="bottom" nowrap="nowrap">  </td> <td valign="bottom"> </td> <td valign="bottom">$</td> <td valign="bottom" align="right">14.80</td> <td valign="bottom" nowrap="nowrap">  </td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom" align="right">3,169,169</td> <td valign="bottom" nowrap="nowrap">  </td> <td valign="bottom"> </td> <td valign="bottom">$</td> <td valign="bottom" align="right">27.72</td> <td valign="bottom" nowrap="nowrap">  </td> </tr> <tr bgcolor="#CCEEFF"> <td valign="top"> Year ended December 31, 2010: </td> <td valign="bottom">  </td> <td valign="bottom"></td> <td valign="bottom"></td> <td valign="bottom"></td> <td valign="bottom"> </td> <td valign="bottom"></td> <td valign="bottom"></td> <td valign="bottom"></td> <td valign="bottom">  </td> <td valign="bottom"></td> <td valign="bottom"></td> <td valign="bottom"></td> <td valign="bottom"> </td> <td valign="bottom"></td> <td valign="bottom"></td> <td valign="bottom"></td> </tr> <tr> <td valign="top"> Granted </td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom" align="right">38,138</td> <td valign="bottom" nowrap="nowrap">  </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" align="right">8.34</td> <td valign="bottom" nowrap="nowrap">  </td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom" align="right">1,966</td> <td valign="bottom" nowrap="nowrap">  </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" align="right">8.00</td> <td valign="bottom" nowrap="nowrap">  </td> </tr> <tr bgcolor="#CCEEFF"> <td valign="top"> Exercised </td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom" align="right">(36,284</td> <td valign="bottom" nowrap="nowrap">) </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" align="right">3.56</td> <td valign="bottom" nowrap="nowrap">  </td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom" align="right">(17,102</td> <td valign="bottom" nowrap="nowrap">) </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" align="right">8.40</td> <td valign="bottom" nowrap="nowrap">  </td> </tr> <tr> <td valign="top"> Forfeited and canceled </td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom" align="right">(97,171</td> <td valign="bottom" nowrap="nowrap">) </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" align="right">36.62</td> <td valign="bottom" nowrap="nowrap">  </td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom" align="right">(289,160</td> <td valign="bottom" nowrap="nowrap">) </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" align="right">117.60</td> <td valign="bottom" nowrap="nowrap">  </td> </tr> <tr style="FONT-SIZE: 1px"> <td valign="bottom"></td> <td valign="bottom">  </td> <td valign="bottom">   </td> <td valign="bottom">   </td> <td> </td> <td valign="bottom"> </td> <td valign="bottom">   </td> <td valign="bottom">   </td> <td> </td> <td valign="bottom">  </td> <td valign="bottom">   </td> <td valign="bottom">   </td> <td> </td> <td valign="bottom"> </td> <td valign="bottom">   </td> <td valign="bottom">   </td> <td> </td> </tr> <tr bgcolor="#CCEEFF"> <td valign="top"> Outstanding at December 31, 2010 </td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom" align="right">385,516</td> <td valign="bottom" nowrap="nowrap">  </td> <td valign="bottom"> </td> <td valign="bottom">$</td> <td valign="bottom" align="right">8.60</td> <td valign="bottom" nowrap="nowrap">  </td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom" align="right">2,864,873</td> <td valign="bottom" nowrap="nowrap">  </td> <td valign="bottom"> </td> <td valign="bottom">$</td> <td valign="bottom" align="right">11.00</td> <td valign="bottom" nowrap="nowrap">  </td> </tr> <tr> <td valign="top"> Year ended December 31, 2011: </td> <td valign="bottom">  </td> <td valign="bottom"></td> <td valign="bottom"></td> <td valign="bottom"></td> <td valign="bottom"> </td> <td valign="bottom"></td> <td valign="bottom"></td> <td valign="bottom"></td> <td valign="bottom">  </td> <td valign="bottom"></td> <td valign="bottom"></td> <td valign="bottom"></td> <td valign="bottom"> </td> <td valign="bottom"></td> <td valign="bottom"></td> <td valign="bottom"></td> </tr> <tr bgcolor="#CCEEFF"> <td valign="top"> Granted </td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom" align="right">76,157</td> <td valign="bottom" nowrap="nowrap">  </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" align="right">6.29</td> <td valign="bottom" nowrap="nowrap">  </td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom" align="right">414,649</td> <td valign="bottom" nowrap="nowrap">  </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" align="right">10.44</td> <td valign="bottom" nowrap="nowrap">  </td> </tr> <tr> <td valign="top"> Exercised </td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom" align="right">—  </td> <td valign="bottom" nowrap="nowrap">  </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" align="right">—  </td> <td valign="bottom" nowrap="nowrap">  </td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom" align="right">—  </td> <td valign="bottom" nowrap="nowrap">  </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" align="right">—  </td> <td valign="bottom" nowrap="nowrap">  </td> </tr> <tr bgcolor="#CCEEFF"> <td valign="top"> Forfeited and canceled </td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom" align="right">(18,750</td> <td valign="bottom" nowrap="nowrap">) </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" align="right">20.00</td> <td valign="bottom" nowrap="nowrap">  </td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom" align="right">(671,972</td> <td valign="bottom" nowrap="nowrap">) </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" align="right">23.72</td> <td valign="bottom" nowrap="nowrap">  </td> </tr> <tr style="FONT-SIZE: 1px"> <td valign="bottom"></td> <td valign="bottom">  </td> <td valign="bottom">   </td> <td valign="bottom">   </td> <td> </td> <td valign="bottom"> </td> <td valign="bottom">   </td> <td valign="bottom">   </td> <td> </td> <td valign="bottom">  </td> <td valign="bottom">   </td> <td valign="bottom">   </td> <td> </td> <td valign="bottom"> </td> <td valign="bottom">   </td> <td valign="bottom">   </td> <td> </td> </tr> <tr> <td valign="top"> Outstanding at December 31, 2011 </td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom" align="right">442,923</td> <td valign="bottom" nowrap="nowrap">  </td> <td valign="bottom"> </td> <td valign="bottom">$</td> <td valign="bottom" align="right">7.71</td> <td valign="bottom" nowrap="nowrap">  </td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom" align="right">2,607,550</td> <td valign="bottom" nowrap="nowrap">  </td> <td valign="bottom"> </td> <td valign="bottom">$</td> <td valign="bottom" align="right">6.66</td> <td valign="bottom" nowrap="nowrap">  </td> </tr> <tr bgcolor="#CCEEFF"> <td valign="top"> Year ended December 31, 2012: </td> <td valign="bottom">  </td> <td valign="bottom"></td> <td valign="bottom"></td> <td valign="bottom"></td> <td valign="bottom"> </td> <td valign="bottom"></td> <td valign="bottom"></td> <td valign="bottom"></td> <td valign="bottom">  </td> <td valign="bottom"></td> <td valign="bottom"></td> <td valign="bottom"></td> <td valign="bottom"> </td> <td valign="bottom"></td> <td valign="bottom"></td> <td valign="bottom"></td> </tr> <tr> <td valign="top"> Granted </td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom" align="right">411,938</td> <td valign="bottom" nowrap="nowrap">  </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" align="right">3.68</td> <td valign="bottom" nowrap="nowrap">  </td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom" align="right">1,436,121</td> <td valign="bottom" nowrap="nowrap">  </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" align="right">2.56</td> <td valign="bottom" nowrap="nowrap">  </td> </tr> <tr bgcolor="#CCEEFF"> <td valign="top"> Exercised </td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom" align="right">—  </td> <td valign="bottom" nowrap="nowrap">  </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" align="right">—  </td> <td valign="bottom" nowrap="nowrap">  </td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom" align="right">—  </td> <td valign="bottom" nowrap="nowrap">  </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" align="right">—  </td> <td valign="bottom" nowrap="nowrap">  </td> </tr> <tr> <td valign="top"> Forfeited and canceled </td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom" align="right">(30,241</td> <td valign="bottom" nowrap="nowrap">) </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" align="right">11.80</td> <td valign="bottom" nowrap="nowrap">  </td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom" align="right">(464,584</td> <td valign="bottom" nowrap="nowrap">) </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" align="right">6.12</td> <td valign="bottom" nowrap="nowrap">  </td> </tr> <tr style="FONT-SIZE: 1px"> <td valign="bottom"></td> <td valign="bottom">  </td> <td valign="bottom">   </td> <td valign="bottom">   </td> <td> </td> <td valign="bottom"> </td> <td valign="bottom">   </td> <td valign="bottom">   </td> <td> </td> <td valign="bottom">  </td> <td valign="bottom">   </td> <td valign="bottom">   </td> <td> </td> <td valign="bottom"> </td> <td valign="bottom">   </td> <td valign="bottom">   </td> <td> </td> </tr> <tr bgcolor="#CCEEFF"> <td valign="top"> Outstanding at December 31, 2012 </td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom" align="right">824,620</td> <td valign="bottom" nowrap="nowrap">  </td> <td valign="bottom"> </td> <td valign="bottom">$</td> <td valign="bottom" align="right">5.54</td> <td valign="bottom" nowrap="nowrap">  </td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom" align="right">3,579,087</td> <td valign="bottom" nowrap="nowrap">  </td> <td valign="bottom"> </td> <td valign="bottom">$</td> <td valign="bottom" align="right">5.64</td> <td valign="bottom" nowrap="nowrap">  </td> </tr> <tr style="FONT-SIZE: 1px"> <td valign="bottom"></td> <td valign="bottom">  </td> <td valign="bottom">   </td> <td valign="bottom">   </td> <td> </td> <td valign="bottom"> </td> <td valign="bottom">   </td> <td valign="bottom">   </td> <td> </td> <td valign="bottom">  </td> <td valign="bottom">   </td> <td valign="bottom">   </td> <td> </td> <td valign="bottom"> </td> <td valign="bottom">   </td> <td valign="bottom">   </td> <td> </td> </tr> </table> </div>falsefalsefalsenonnum:textBlockItemTypenaSchedule Of Stock Option And Warrants Activity Table.No definition available.false0Summary Information Regarding Options and Warrants2false 4opxa_ScheduleOfStockOptionsOutstandingAndExercisableTableTextBlockopxa_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00<div> Summary of options outstanding and exercisable as of December 31, 2012 is as follows:   <table style="BORDER-COLLAPSE: collapse" border="0" cellspacing="0" cellpadding="0" width="92%" align="center"> <tr> <td width="52%"></td> <td valign="bottom" width="11%"></td> <td></td> <td></td> <td></td> <td valign="bottom" width="11%"></td> <td></td> <td></td> <td></td> <td valign="bottom" width="11%"></td> <td></td> <td></td> <td></td> </tr> <tr> <td valign="bottom" nowrap="nowrap"> Range of Exercise Prices </td> <td valign="bottom">  </td> <td style="BORDER-BOTTOM: #000000 1px solid" valign="bottom" colspan="2" align="center">Weighted Average Remaining Contractual Life (years)</td> <td valign="bottom"> </td> <td valign="bottom">  </td> <td style="BORDER-BOTTOM: #000000 1px solid" valign="bottom" colspan="2" align="center">Number of Options Outstanding</td> <td valign="bottom"> </td> <td valign="bottom">  </td> <td style="BORDER-BOTTOM: #000000 1px solid" valign="bottom" colspan="2" align="center">Number of Options Exercisable</td> <td valign="bottom"> </td> </tr> <tr bgcolor="#CCEEFF"> <td valign="top"> $ 0.88 to $ 4.99 </td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom" align="right">5.84</td> <td valign="bottom" nowrap="nowrap">  </td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom" align="right">599,706</td> <td valign="bottom" nowrap="nowrap">  </td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom" align="right">258,337</td> <td valign="bottom" nowrap="nowrap">  </td> </tr> <tr> <td valign="top"> 5.00 to 9.99 </td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom" align="right">1.58</td> <td valign="bottom" nowrap="nowrap">  </td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom" align="right">178,054</td> <td valign="bottom" nowrap="nowrap">  </td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom" align="right">157,221</td> <td valign="bottom" nowrap="nowrap">  </td> </tr> <tr bgcolor="#CCEEFF"> <td valign="top"> 10.00 to 39.20 </td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom" align="right">0.21</td> <td valign="bottom" nowrap="nowrap">  </td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom" align="right">46,860</td> <td valign="bottom" nowrap="nowrap">  </td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom" align="right">46,860</td> <td valign="bottom" nowrap="nowrap">  </td> </tr> <tr style="FONT-SIZE: 1px"> <td valign="bottom"></td> <td valign="bottom">  </td> <td valign="bottom">   </td> <td valign="bottom">   </td> <td> </td> <td valign="bottom">  </td> <td valign="bottom">   </td> <td valign="bottom">   </td> <td> </td> <td valign="bottom">  </td> <td valign="bottom">   </td> <td valign="bottom">   </td> <td> </td> </tr> <tr> <td valign="top"> $ 0.88 to $39.20 </td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom" align="right">7.63</td> <td valign="bottom" nowrap="nowrap">  </td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom" align="right">824,620</td> <td valign="bottom" nowrap="nowrap">  </td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom" align="right">462,418</td> <td valign="bottom" nowrap="nowrap">  </td> </tr> <tr style="FONT-SIZE: 1px"> <td valign="bottom"></td> <td valign="bottom">  </td> <td valign="bottom">   </td> <td valign="bottom">   </td> <td> </td> <td valign="bottom">  </td> <td valign="bottom">   </td> <td valign="bottom">   </td> <td> </td> <td valign="bottom">  </td> <td valign="bottom">   </td> <td valign="bottom">   </td> <td> </td> </tr> </table> </div>falsefalsefalsenonnum:textBlockItemTypenaSchedule Of Stock Options Outstanding And Exercisable Table [Text Block]No definition available.false0Summary of Options Outstanding and Exercisable3false 4opxa_ScheduleOfShareBasedCompensationWarrantOutstandingAndExercisableByExercisePriceRangeTableTextBlockopxa_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00<div> Summary of warrants outstanding and exercisable as of December 31, 2012 is as follows:   <table style="BORDER-COLLAPSE: collapse" border="0" cellspacing="0" cellpadding="0" width="92%" align="center"> <tr> <td width="48%"></td> <td valign="bottom" width="11%"></td> <td></td> <td></td> <td></td> <td valign="bottom" width="11%"></td> <td></td> <td></td> <td></td> <td valign="bottom" width="11%"></td> <td></td> <td></td> <td></td> </tr> <tr> <td valign="bottom" nowrap="nowrap"> Range of Exercise Prices </td> <td valign="bottom">  </td> <td style="BORDER-BOTTOM: #000000 1px solid" valign="bottom" colspan="2" align="center">Weighted Average Remaining Contractual Life (years)</td> <td valign="bottom"> </td> <td valign="bottom">  </td> <td style="BORDER-BOTTOM: #000000 1px solid" valign="bottom" colspan="2" align="center">Number of Warrants Outstanding</td> <td valign="bottom"> </td> <td valign="bottom">  </td> <td style="BORDER-BOTTOM: #000000 1px solid" valign="bottom" colspan="2" align="center">Number of Warrants Exercisable</td> <td valign="bottom"> </td> </tr> <tr bgcolor="#CCEEFF"> <td valign="top"> $ 0.18 to $ 4.99 </td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom" align="right">1.86</td> <td valign="bottom" nowrap="nowrap">  </td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom" align="right">1,850,102</td> <td valign="bottom" nowrap="nowrap">  </td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom" align="right">413,981</td> <td valign="bottom" nowrap="nowrap">  </td> </tr> <tr> <td valign="top"> 5.00 to 9.99 </td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom" align="right">0.04</td> <td valign="bottom" nowrap="nowrap">  </td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom" align="right">1,068,905</td> <td valign="bottom" nowrap="nowrap">  </td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom" align="right">1,068,905</td> <td valign="bottom" nowrap="nowrap">  </td> </tr> <tr bgcolor="#CCEEFF"> <td valign="top"> 10.00 to 10.44 </td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom" align="right">0.53</td> <td valign="bottom" nowrap="nowrap">  </td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom" align="right">660,080</td> <td valign="bottom" nowrap="nowrap">  </td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom" align="right">660,080</td> <td valign="bottom" nowrap="nowrap">  </td> </tr> <tr style="FONT-SIZE: 1px"> <td valign="bottom"></td> <td valign="bottom">  </td> <td valign="bottom">   </td> <td valign="bottom">   </td> <td> </td> <td valign="bottom">  </td> <td valign="bottom">   </td> <td valign="bottom">   </td> <td> </td> <td valign="bottom">  </td> <td valign="bottom">   </td> <td valign="bottom">   </td> <td> </td> </tr> <tr> <td valign="top"> $ 0.18 to $10.44 </td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom" align="right">2.43</td> <td valign="bottom" nowrap="nowrap">  </td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom" align="right">3,579,087</td> <td valign="bottom" nowrap="nowrap">  </td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom" align="right">2,142,966</td> <td valign="bottom" nowrap="nowrap">  </td> </tr> <tr style="FONT-SIZE: 1px"> <td valign="bottom"></td> <td valign="bottom">  </td> <td valign="bottom">   </td> <td valign="bottom">   </td> <td> </td> <td valign="bottom">  </td> <td valign="bottom">   </td> <td valign="bottom">   </td> <td> </td> <td valign="bottom">  </td> <td valign="bottom">   </td> <td valign="bottom">   </td> <td> </td> </tr> </table> </div>falsefalsefalsenonnum:textBlockItemTypenaSchedule of Share Based Compensation Warrant Outstanding and Exercisable by Exercise Price Range.No definition available.false0Summary of Warrants Outstanding and Exercisable4false 4us-gaap_ScheduleOfShareBasedCompensationStockOptionsActivityTableTextBlockus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00<div> A summary of stock option activity for the three months ended March 31, 2013 is presented below:   <table style="BORDER-COLLAPSE: collapse" border="0" cellspacing="0" cellpadding="0" width="92%" align="center"> <tr> <td width="59%"></td> <td valign="bottom" width="6%"></td> <td></td> <td></td> <td></td> <td valign="bottom" width="6%"></td> <td></td> <td></td> <td></td> <td valign="bottom" width="6%"></td> <td></td> <td></td> <td></td> <td valign="bottom" width="6%"></td> <td></td> <td></td> <td></td> </tr> <tr> <td valign="bottom"> </td> <td valign="bottom">  </td> <td style="BORDER-BOTTOM: #000000 1px solid" valign="bottom" colspan="2" align="center">Number of Shares</td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td style="BORDER-BOTTOM: #000000 1px solid" valign="bottom" colspan="2" align="center">Wtd. Avg. Exercise Price</td> <td valign="bottom"> </td> <td valign="bottom">  </td> <td style="BORDER-BOTTOM: #000000 1px solid" valign="bottom" colspan="2" align="center">Wtd. Avg. Remaining Contract Term (# years)</td> <td valign="bottom"> </td> <td valign="bottom">  </td> <td style="BORDER-BOTTOM: #000000 1px solid" valign="bottom" colspan="2" align="center">Intrinsic Value</td> <td valign="bottom"> </td> </tr> <tr bgcolor="#CCEEFF"> <td valign="top"> Outstanding at January 1, 2013 </td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom" align="right">824,620</td> <td valign="bottom" nowrap="nowrap">  </td> <td valign="bottom"> </td> <td valign="bottom">$</td> <td valign="bottom" align="right">5.54</td> <td valign="bottom" nowrap="nowrap">  </td> <td valign="bottom">  </td> <td valign="bottom"></td> <td valign="bottom"></td> <td valign="bottom"></td> <td valign="bottom">  </td> <td valign="bottom"></td> <td valign="bottom"></td> <td valign="bottom"></td> </tr> <tr> <td valign="top"> Granted </td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom" align="right">125,000</td> <td valign="bottom" nowrap="nowrap">  </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" align="right">2.34</td> <td valign="bottom" nowrap="nowrap">  </td> <td valign="bottom">  </td> <td valign="bottom"></td> <td valign="bottom"></td> <td valign="bottom"></td> <td valign="bottom">  </td> <td valign="bottom"></td> <td valign="bottom"></td> <td valign="bottom"></td> </tr> <tr bgcolor="#CCEEFF"> <td valign="top"> Exercised </td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom" align="right">—  </td> <td valign="bottom" nowrap="nowrap">  </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" align="right">—  </td> <td valign="bottom" nowrap="nowrap">  </td> <td valign="bottom">  </td> <td valign="bottom"></td> <td valign="bottom"></td> <td valign="bottom"></td> <td valign="bottom">  </td> <td valign="bottom"></td> <td valign="bottom"></td> <td valign="bottom"></td> </tr> <tr> <td valign="top"> Forfeited and canceled </td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom" align="right">(46,331</td> <td valign="bottom" nowrap="nowrap">) </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" align="right">4.73</td> <td valign="bottom" nowrap="nowrap">  </td> <td valign="bottom">  </td> <td valign="bottom"></td> <td valign="bottom"></td> <td valign="bottom"></td> <td valign="bottom">  </td> <td valign="bottom"></td> <td valign="bottom"></td> <td valign="bottom"></td> </tr> <tr style="FONT-SIZE: 1px"> <td valign="bottom"></td> <td valign="bottom">  </td> <td valign="bottom">   </td> <td valign="bottom">   </td> <td> </td> <td valign="bottom"> </td> <td valign="bottom">   </td> <td valign="bottom">   </td> <td> </td> <td valign="bottom">  </td> <td valign="bottom"></td> <td valign="bottom"></td> <td valign="bottom"></td> <td valign="bottom">  </td> <td valign="bottom"></td> <td valign="bottom"></td> <td valign="bottom"></td> </tr> <tr bgcolor="#CCEEFF"> <td valign="top"> Outstanding at March 31, 2013 </td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom" align="right">903,289</td> <td valign="bottom" nowrap="nowrap">  </td> <td valign="bottom"> </td> <td valign="bottom">$</td> <td valign="bottom" align="right">5.14</td> <td valign="bottom" nowrap="nowrap">  </td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom" align="right">7.7</td> <td valign="bottom" nowrap="nowrap">  </td> <td valign="bottom">  </td> <td valign="bottom">$</td> <td valign="bottom" align="right">104,769</td> <td valign="bottom" nowrap="nowrap">  </td> </tr> <tr> <td valign="top"> Exercisable at March 31, 2013 </td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom" align="right">485,124</td> <td valign="bottom" nowrap="nowrap">  </td> <td valign="bottom"> </td> <td valign="bottom">$</td> <td valign="bottom" align="right">6.63</td> <td valign="bottom" nowrap="nowrap">  </td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom" align="right">6.5</td> <td valign="bottom" nowrap="nowrap">  </td> <td valign="bottom">  </td> <td valign="bottom">$</td> <td valign="bottom" align="right">100,730</td> <td valign="bottom" nowrap="nowrap">  </td> </tr> </table> </div>falsefalsefalse2falsefalsefalse00falsefalsefalsenonnum:textBlockItemTypenaTabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for share options (or share units) that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units that were granted, exercised or converted, forfeited, and expired during the year.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 false0Stock Option Activity5false 4us-gaap_ScheduleOfStockholdersEquityNoteWarrantsOrRightsTextBlockus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00<div> A summary of warrant activity for the three months ended March 31, 2013 is presented below:   <table style="BORDER-COLLAPSE: collapse" border="0" cellspacing="0" cellpadding="0" width="92%" align="center"> <tr> <td width="57%"></td> <td valign="bottom" width="6%"></td> <td></td> <td></td> <td></td> <td valign="bottom" width="6%"></td> <td></td> <td></td> <td></td> <td valign="bottom" width="6%"></td> <td></td> <td></td> <td></td> <td valign="bottom" width="6%"></td> <td></td> <td></td> <td></td> </tr> <tr> <td valign="bottom"> </td> <td valign="bottom">  </td> <td style="BORDER-BOTTOM: #000000 1px solid" valign="bottom" colspan="2" align="center">Number of Shares</td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td style="BORDER-BOTTOM: #000000 1px solid" valign="bottom" colspan="2" align="center">Wtd. Avg. Exercise Price</td> <td valign="bottom"> </td> <td valign="bottom">  </td> <td style="BORDER-BOTTOM: #000000 1px solid" valign="bottom" colspan="2" align="center">Wtd. Avg. Remaining Contract Term (# years)</td> <td valign="bottom"> </td> <td valign="bottom">  </td> <td style="BORDER-BOTTOM: #000000 1px solid" valign="bottom" colspan="2" align="center">Intrinsic Value</td> <td valign="bottom"> </td> </tr> <tr bgcolor="#CCEEFF"> <td valign="top"> Outstanding at January 1, 2013 </td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom" align="right">3,579,087</td> <td valign="bottom" nowrap="nowrap">  </td> <td valign="bottom"> </td> <td valign="bottom">$</td> <td valign="bottom" align="right">5.64</td> <td valign="bottom" nowrap="nowrap">  </td> <td valign="bottom">  </td> <td valign="bottom"></td> <td valign="bottom"></td> <td valign="bottom"></td> <td valign="bottom">  </td> <td valign="bottom"></td> <td valign="bottom"></td> <td valign="bottom"></td> </tr> <tr> <td valign="top"> Granted </td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom" align="right">972,918</td> <td valign="bottom" nowrap="nowrap">  </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" align="right">2.21</td> <td valign="bottom" nowrap="nowrap">  </td> <td valign="bottom">  </td> <td valign="bottom"></td> <td valign="bottom"></td> <td valign="bottom"></td> <td valign="bottom">  </td> <td valign="bottom"></td> <td valign="bottom"></td> <td valign="bottom"></td> </tr> <tr bgcolor="#CCEEFF"> <td valign="top"> Exercised </td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom" align="right">—  </td> <td valign="bottom" nowrap="nowrap">  </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" align="right">—  </td> <td valign="bottom" nowrap="nowrap">  </td> <td valign="bottom">  </td> <td valign="bottom"></td> <td valign="bottom"></td> <td valign="bottom"></td> <td valign="bottom">  </td> <td valign="bottom"></td> <td valign="bottom"></td> <td valign="bottom"></td> </tr> <tr> <td valign="top"> Forfeited and canceled </td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom" align="right">(1,129,359</td> <td valign="bottom" nowrap="nowrap">) </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" align="right">7.65</td> <td valign="bottom" nowrap="nowrap">  </td> <td valign="bottom">  </td> <td valign="bottom"></td> <td valign="bottom"></td> <td valign="bottom"></td> <td valign="bottom">  </td> <td valign="bottom"></td> <td valign="bottom"></td> <td valign="bottom"></td> </tr> <tr style="FONT-SIZE: 1px"> <td valign="bottom"></td> <td valign="bottom">  </td> <td valign="bottom">   </td> <td valign="bottom">   </td> <td> </td> <td valign="bottom"> </td> <td valign="bottom">   </td> <td valign="bottom">   </td> <td> </td> <td valign="bottom">  </td> <td valign="bottom"></td> <td valign="bottom"></td> <td valign="bottom"></td> <td valign="bottom">  </td> <td valign="bottom"></td> <td valign="bottom"></td> <td valign="bottom"></td> </tr> <tr bgcolor="#CCEEFF"> <td valign="top"> Outstanding at March 31, 2013 </td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom" align="right">3,422,646</td> <td valign="bottom" nowrap="nowrap">  </td> <td valign="bottom"> </td> <td valign="bottom">$</td> <td valign="bottom" align="right">4.01</td> <td valign="bottom" nowrap="nowrap">  </td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom" align="right">3.5</td> <td valign="bottom" nowrap="nowrap">  </td> <td valign="bottom">  </td> <td valign="bottom">$</td> <td valign="bottom" align="right">480,000</td> <td valign="bottom" nowrap="nowrap">  </td> </tr> <tr> <td valign="top"> Exercisable at March 31, 2013 </td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom" align="right">3,422,646</td> <td valign="bottom" nowrap="nowrap">  </td> <td valign="bottom"> </td> <td valign="bottom">$</td> <td valign="bottom" align="right">4.01</td> <td valign="bottom" nowrap="nowrap">  </td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom" align="right">3.5</td> <td valign="bottom" nowrap="nowrap">  </td> <td valign="bottom">  </td> <td valign="bottom">$</td> <td valign="bottom" align="right">480,000</td> <td valign="bottom" nowrap="nowrap">  </td> </tr> </table> </div>falsefalsefalse2falsefalsefalse00falsefalsefalsenonnum:textBlockItemTypenaTabular disclosure of warrants or rights issued. Warrants and rights outstanding are derivative securities that give the holder the right to purchase securities (usually equity) from the issuer at a specific price within a certain time frame. Warrants are often included in a new debt issue to entice investors by a higher return potential. The main difference between warrants and call options is that warrants are issued and guaranteed by the company, whereas options are exchange instruments and are not issued by the company. Also, the lifetime of a warrant is often measured in years, while the lifetime of a typical option is measured in months. Disclose the title of issue of securities called for by warrants and rights outstanding, the aggregate amount of securities called for by warrants and rights outstanding, the date from which the warrants or rights are exercisable, and the price at which the warrant or right is exercisable.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(i)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph i -Article 4 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 50 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6406099&loc=d3e25284-112666 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 50 -Section S99 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6784392&loc=d3e188667-122775 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 28 -Article 5 false0Warrant ActivityfalseStock-Based Compensation/Options and Warrants (Tables)UnKnownUnKnownUnKnownUnKnowntruefalsefalseSheethttp://www.opexatherapeutics.com/taxonomy/role/NotesToFinancialStatementsDisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlockTables25