Quarterly report pursuant to Section 13 or 15(d)

Accrued Expenses (Details 1)

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Accrued Expenses (Details 1) (USD $)
3 Months Ended
Jun. 30, 2014
Accounts Payable And Accrued Expenses [Line Items]  
Balance as of December 31, 2013 $ 514,000
Additional warranty liability accrued 438,076
Warranty costs incurred (276,295)
Balance at June 30, 2014 $ 675,781