Quarterly report pursuant to sections 13 or 15(d)

Changes in Warranty Liability (Detail)

v2.4.0.8
Changes in Warranty Liability (Detail) (USD $)
6 Months Ended
Jun. 30, 2013
Product Warranty [Line Items]  
Warranty reserves at January 1 $ 345,974
Provisions for current period sales 208,174
Current period claims (87,081)
Warranty reserves at June 30 $ 467,067