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Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2017
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):
| Year ended December 31,
| 2017 |  | 2016 |  | 2015
Balance, beginning of year | $ | 664 |  |  | $ | 709 |  |  | $ | 510 |
Charged to provision for doubtful accounts | 113 |  |  | 558 |  |  | 367 |
Write-offs | (44 | ) |  | (603 | ) |  | (168 | )
Balance, end of year | $ | 733 |  |  | $ | 664 |  |  | $ | 709 |
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, equipment, and rental tools | 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 the useful lives of major classes of property, plant and equipment. + References No definition available. + Details
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- Definition Tabular disclosure of financing receivables (examples of financing receivables include loans, trade accounts receivable and notes receivable) and activity in the allowance for credit losses account. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 + Details
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