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Shares Reserved (Tables)
12 Months Ended
Dec. 31, 2012
Notes to Financial Statements  
Common stock reserved for future issuance
   December 31,
   2012  2011
Stock option grants outstanding (see Note 10)   1,624,188    1,410,090 
Reserved for future stock option grants (see Note 12)   62,438    90,571 
Reserved for note conversion (see Note 2)   621,213    —   
Reserved for exercise of outstanding warrants (see Note 11)   607,776    624,442 
    2,294,402    2,125,103