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Valuation and Qualifying Accounts (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Allowance for Doubtful Accounts [Member] |  |  |
Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Balance at Beginning of Period | $ 22 | $ 82 | $ 188
Additions Charged to Costs and Expenses | 34 |  |
Deductions, Accounts Charged Off and Recoveries of Amounts Previously Written Off |  | (60) | (106)
Balance at End of Period | 56 | 22 | 82
Valuation Allowance of Deferred Tax Assets [Member] |  |  |
Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Balance at Beginning of Period | 5,197 | 5,797 | 6,219
Additions Charged to Costs and Expenses |  |  |
Deductions, Accounts Charged Off and Recoveries of Amounts Previously Written Off | 1,066 | (600) | (422)
Balance at End of Period | 6,263 | 5,197 | 5,797
Inventory Valuation Reserve [Member] |  |  |
Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Balance at Beginning of Period | 4,307 | 3,793 | 2,381
Additions Charged to Costs and Expenses | 2,672 | 2,344 | 1,458
Deductions, Accounts Charged Off and Recoveries of Amounts Previously Written Off | (819) | (1,830) | (46)
Balance at End of Period | $ 6,160 | $ 4,307 | $ 3,793

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- Definition Valuation Allowances and Reserves, Deductions, Accounts Charged Off and Recoveries of Amounts Previously Written Off + References No definition available. + Details
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- Definition Total of allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 + Details
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- Definition Amount of increase in the allowances and reserves, which consist of the valuation and qualifying accounts that are either netted against the cost of an asset or that reflect a liability established to represent expected future costs, from charges to costs and expenses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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