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Product Warranty Provisions (Tables)
6 Months Ended
Jun. 30, 2018
Product Warranties Disclosures [Abstract]  
Schedule of Accrued Warranty

Accrued warranty, which is included in other accrued liabilities, consists of the following:

 

    June 30, 2018     December 31, 2017  
Warranty accrual, beginning of the fiscal period   $ 164,365     $ 222,845  
Accrual adjustment for product warranty     (4,153 )     32,679  
Payments made     (16,221 )     (91,159 )
Warranty accrual, end of the fiscal period   $ 143,991     $ 164,365