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Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2021
Accounting Policies [Abstract] |
Activity in Allowance for Doubtful Accounts | Activity in the allowance for doubtful accounts is as follows (in thousands):
Allowance for doubtful accounts |  | Balance at beginning of period |  |  | Additions/ charges |  |  | Deductions (1) |  |  | Balance at end of period |
Year ended December 31, 2021 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Allowance for doubtful accounts |  | $ | 973 |  |  |  | 962 |  |  |  | 502 |  |  | $ | 1,433 |
Year ended December 31, 2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Allowance for doubtful accounts |  | $ | 962 |  |  |  | 918 |  |  |  | 907 |  |  | $ | 973 |
Year ended December 31, 2019 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Allowance for doubtful accounts |  | $ | 945 |  |  |  | 343 |  |  |  | 326 |  |  | $ | 962 |
(1) Write-offs, net of recoveries
Estimated Useful Lives of Property and Equipment | The estimated useful lives of the property and equipment are as follows:
Computer equipment |  | 3-5 years
Furniture and equipment |  | 5-7 years
Transportation equipment |  | 5 years
Computer software |  | 3-10 years
Leasehold improvements |  | Lesser of useful life or lease term

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- Definition Tabular disclosure of allowance for credit loss on accounts receivable. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447 + Details
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