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Product Warranty Provisions (Tables)
6 Months Ended
Jun. 30, 2021
Guarantees and Product Warranties [Abstract]  
Schedule of Accrued Warranty

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

 

   June 30, 2021   December 31, 2020 
Warranty accrual, beginning of the fiscal period  $157,615   $141,697 
Accrual adjustment for product warranty   139,831    49,974 
Payments made   (75,240)   (34,056)
Warranty accrual, end of the fiscal period  $222,206   $157,615