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Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2019

Changes in Allowance for Doubtful Accounts

The changes in our allowance for doubtful accounts for the years ended December 31, 2019 and 2018 were as follows:

	Years ended December 31,
	2019			2018
Beginning balance	$	929,339		$	699,102
Bad debt expense		60,000			1,085,622
Uncollectible accounts written off, net of recoveries		(221,875	)		(855,385	)
Ending balance	$	767,464		$	929,339

Schedule of Property and Equipment Useful Lives

The useful lives of property and equipment for purposes of computing depreciation are as follows:

Vehicles		5 to 7 years
Computer equipment		3 to 5 years
Office furniture and fixtures		5 to 7 years
Machinery and equipment		5 to 7 years
Leasehold improvements		5 to 7 years

Schedule of Number of Customers that Accounted for More than Ten Percentage of Annual Sales and Receivable Balances

The following table discloses the number of customers that accounted for more than 10% of our annual revenue and their related receivable balances for the years ended December 31, 2019 and 2018:

	Customers Exceeding 10% of Revenue
Year	Number of Customers		Revenue Combined Percent			Accounts Receivable Combined Percent
2019		3		53	%		36	%
2018		3		51	%		33	%