Issue Date | Expiration Date | Shares Subject to Outstanding Warrants | Exercise Price at End of Period | Reference | ||||||
October 27, 2006 | April 27, 2014 | 372,770 | $ | 1.51 | (1) (2) (3) | |||||
June 22, 2007 | December 22, 2014 | 64,392 | $ | 167.20 | (3) | |||||
August 25, 2008 | August 25, 2015 | 349,741 | $ | 154.40 | (1) (2) (3) | |||||
August 3, 2009 | August 3, 2014 | 7,985 | $ | 68.00 | (4) | |||||
September 4, 2009 | September 4, 2014 | 20,834 | $ | 68.00 | (4) | |||||
April 30, 2010 through July 1, 2010 | April 30, 2015 through July 1, 2015 | 55,473 | $ | 72.80 | * | |||||
October 13, 2010 and October 19, 2010 | October 13, 2015 and October 19, 2015 | 9,037 | $ | 53.60 | * | |||||
January 3, 2011 | February 18, 2014 | 69,441 | $ | 36.00 | * | |||||
January 12, 2011 | January 12, 2014 | 32,969 | $ | 36.80 | * | |||||
February 18, 2011 | February 18, 2016 | 189,836 | $ | 26.28 | * | |||||
February 18, 2011; Series "B" | February 18, 2016 | 98,481 | $ | 24.00 | (3) | |||||
May 9, 2011 | May 8, 2014 | 19,611 | $ | 11.68 | * | |||||
May 20, 2011 | May 19, 2014 | 22,576 | $ | 11.68 | * | |||||
June 15, 2011 | June 15, 2016 | 361,458 | $ | 15.40 | * | |||||
June 15, 2011 | June 15, 2018 | 11,250 | $ | 12.48 | * | |||||
June 15, 2011 | June 15, 2018 | 30,064 | $ | 15.40 | * | |||||
June 20, 2011 | June 20, 2016 | 14,269 | $ | 15.60 | * | |||||
June 20, 2011 | June 20, 2018 | 31 | $ | 15.60 | * | |||||
July 6, 2011 | July 6, 2016 | 104,929 | $ | 15.40 | * | |||||
August 23, 2011 | August 23, 2016 | 28,750 | $ | 15.40 | * | |||||
September 29, 2011 | September 29, 2016 | 4,782 | $ | 3.32 | (4) | |||||
October 12, 2011 | October 12, 2016 | 141,068 | $ | 3.32 | (4) | |||||
October 17, 2011 through October 21, 2011 | October 17, 2016 through October 21, 2016 | 19,138 | $ | 10.56 | * | |||||
November 2, 2011 | November 2, 2014 | 134,998 | $ | 8.48 | * | |||||
December 21, 2011 | December 21, 2016 | 1,329,980 | $ | 4.88 | * | |||||
January 19, 2012 | January 19, 2017 | 33,187 | $ | 4.88 | * | |||||
March 20, 2012; Series "B" | March 20, 2017 | 1,311,000 | $ | 4.08 | * | |||||
March 21, 2012; Series "B" | March 21, 2017 | 1,290,325 | $ | 4.08 | * | |||||
May 3, 2012; Series "B" | May 3, 2017 | 27,612 | $ | 4.08 | * | |||||
May 7, 2012 | May 7, 2019 | 50,000 | $ | 3.60 | * | |||||
June 14, 2012; Series "B" | June 14, 2017 | 51,112 | $ | 4.08 | * | |||||
June 22, 2012 | June 22, 2017 | 1,007,457 | $ | 3.40 | * | |||||
June 28, 2012 | June 28, 2017 | 56,682 | $ | 3.40 | * | |||||
July 25, 2012 | July 25, 2017 | 109,024 | $ | 3.56 | * | |||||
January 24, 2013 | July 25, 2018 | 11,250 | $ | 2.84 | (3) | |||||
September 18, 2013 | March 18, 2019 | 3,411,235 | $ | 2.30 | * | |||||
December 31, 2013 | 10,852,747 | |||||||||