The Company uses the allowance method to account for uncollectible accounts receivable balances. Under the allowance method, an estimate of uncollectible customer balances is made based on the Company’s prior history and other factors such as credit quality of the customer and economic conditions of the market. Based on these factors, at September 30, 2021 and December 31, 2020, there was an allowance for doubtful accounts of $232,847 and $150,847, respectively.