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Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2019
Accounting Policies [Abstract] |
Schedule of changes in the allowance for doubtful accounts | Changes in the allowance for doubtful accounts for continuing operations are as follows (in thousands):
| Years ended December 31,
| 2019 |  | 2018 |  | 2017
Balance, beginning of year | $ | 1,190 |  |  | $ | 673 |  |  | $ | 579 |
Charged to provision for doubtful accounts, net of recoveries | 512 |  |  | 839 |  |  | 157 |
Write-offs | (175 | ) |  | (322 | ) |  | (63 | )
Balance, end of year | $ | 1,527 |  |  | $ | 1,190 |  |  | $ | 673 |
Schedule of depreciation or amortization of property and equipment | Depreciation or amortization of property and equipment, including assets held under capital leases, is calculated using the straight-line method over the asset’s estimated useful life as follows:
Buildings and leasehold improvements | 2-30 years
Machinery and equipment | 7-10 years
Furniture and fixtures | 3 years
Transportation equipment | 2-5 years
Computer equipment and software | 3-7 years

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- Definition Tabular disclosure of allowance for credit loss on financing receivable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -URI http://asc.fasb.org/extlink&oid=118936363&loc=SL6953423-111524 Reference 2: 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=119407570&loc=SL82919249-210447 + Details
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