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Changes in Accrued Warranty Obligations (Detail) (USD $)
9 Months Ended
Sep. 30, 2012
Class Of Warrant Or Right [Line Items]  
Accrued Warranty Obligations at December 31, 2011 $ 118,611
Reductions for Settling Warranties (103,201)
Warranties Issued During Period 131,078
Accrued Warranty Obligations at September 30, 2012 $ 146,488