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Changes in Accrued Warranty Obligations (Detail) (USD $)
3 Months Ended
Mar. 31, 2013
Class Of Warrant Or Right [Line Items]  
Accrued Warranty Obligations at December 31, 2012 $ 93,788
Reductions for Settling Warranties (41,042)
Warranties Issued During Period 12,507
Accrued Warranty Obligations at March 31, 2013 $ 65,253