Annual report pursuant to Section 13 and 15(d)

Product warranty - Schedule of Product Warranty Reserve (Details)

v2.4.0.8
Product warranty - Schedule of Product Warranty Reserve (Details) (USD $)
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Guarantees [Abstract]    
Product warranty period 1 year  
Schedule of Product Warranty Reserve [Roll Forward]    
Warranty reserve, beginning balance $ 90,200 $ 57,000
Warranty provision for units sold 179,841 160,684
Costs of warranty incurred (175,041) (127,484)
Warranty reserve, ending balance $ 95,000 $ 90,200