Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2015

Changes in Allowance for Doubtful Accounts

The changes in our allowance for doubtful accounts for the years ended December 31, 2015 and 2014 were as follows:

	Years ended December 31,
	2015			2014
Beginning balance	$	760,917		$	319,735
Bad debt expense, net of recoveries		265,176			441,338
Uncollectible accounts written off		(439,152	)		(156	)
Ending balance	$	586,941		$	760,917

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, 2015 and 2014:

	Customers Exceeding 10% of Revenue
Year	Number of Customers		Revenue Combined Percent			Accounts Receivable Combined Percent
2015		2		60	%		41	%
2014		2		73	%		36	%