Quarterly report pursuant to Section 13 or 15(d)

Warrants (Details)

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Warrants (Details)
3 Months Ended
Mar. 31, 2013
Schedule of common stock warrants issued and outstanding  
Warrants in a net exercise transaction 0
Warrants Issued on May 25, 2006 and Expiring on May 25, 2013 [Member]
 
Schedule of common stock warrants issued and outstanding  
Issue Date May 25, 2006
Shares Subject to warrants 184,895
Exercise Price per Share 5.96
Expiration May 25, 2013
Warrants Issued on July 17, 2007 and Expiring on February 9, 2016 [Member]
 
Schedule of common stock warrants issued and outstanding  
Issue Date Jul. 17, 2007
Shares Subject to warrants 2,384
Exercise Price per Share 12.45
Expiration Feb. 09, 2016
Warrants Issued on September 28, 2007 and Expiring on September 28, 2017 [Member]
 
Schedule of common stock warrants issued and outstanding  
Issue Date Sep. 28, 2007
Shares Subject to warrants 72,727
Exercise Price per Share 8.25
Expiration Sep. 28, 2017