Quarterly report pursuant to Section 13 or 15(d)

Warrants

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Warrants
9 Months Ended
Sep. 30, 2011
Warrants [Abstract]  
Warrants

9. Warrants

No warrants were exercised during the nine months ended September 30, 2011. At September 30, 2011, the following common stock warrants were issued and outstanding:

 

September 30, 2011

Issue Date

 

Shares Subject
to Warrants

  Exercise Price
per Share
   

Expiration

October 25, 2005

  6,066   $ 1.05      October 25, 2012

May 25, 2006

  184,895   $ 5.96      May 25, 2013

July 17, 2007

  2,384   $ 12.45      February 9, 2016

September 28, 2007

  72,727   $ 8.25      September 28, 2017