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Product Warranty Provisions (Tables)
3 Months Ended
Mar. 31, 2021
Guarantees and Product Warranties [Abstract]  
Schedule of Accrued Warranty

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

 

   March 31, 2021   December 31, 2020 
Warranty accrual, beginning of the fiscal period  $157,615   $141,697 
Accrual adjustment for product warranty   94,596    49,974 
Payments made   (63,620)   (34,056)
Warranty accrual, end of the fiscal period  $188,591   $157,615