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Allowance for Doubtful Accounts | 12 Months Ended
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Dec. 31, 2017
Allowance for Doubtful Accounts [Abstract] |
Allowance for Doubtful Accounts | Allowance for Doubtful Accounts The activity in the allowance for doubtful accounts was as follows during the years ended December 31, 2017 and 2016:
| 2017 |  | 2016
Balance at the beginning of the year | $ | 23,000 |  |  | $ | 17,200 |
Provision for bad debts | 63,000 |  |  | 6,557 |
Charge-offs | (2,211 | ) |  | (874 | )
Recoveries | — |  |  | 117 |
Balance at the end of the year | $ | 83,789 |  |  | $ | 23,000 |

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