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Product Warranty Provisions (Tables)
3 Months Ended
Mar. 31, 2019
Product Warranties Disclosures [Abstract]  
Schedule of Accrued Warranty

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

 

    March 31, 2019     December 31, 2018  
Warranty accrual, beginning of the fiscal period   $ 149,464     $ 164,365  
Accrual adjustment for product warranty     17,135       34,253  
Payments made     (29,653 )     (49,154 )
Warranty accrual, end of the fiscal period   $ 136,946     $ 149,464