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Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2019
Accounting Policies [Abstract] |
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 | %

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