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Product Warranty Provisions (Tables)
6 Months Ended
Jun. 30, 2019
Product Warranties Disclosures [Abstract]  
Schedule of Accrued Warranty

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

 

  June 30, 2019   December 31, 2018 
Warranty accrual, beginning of the fiscal period  $149,464   $164,365 
Accrual adjustment for product warranty   20,040    34,253 
Payments made   (43,684)   (49,154)
Warranty accrual, end of the fiscal period  $125,820   $149,464