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Valuation and Qualifying Accounts | 12 Months Ended
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Dec. 31, 2017
Valuation And Qualifying Accounts [Abstract] |
Valuation and Qualifying Accounts | Schedule II-A—Valuation and Qualifying Accounts Allowance for Doubtful Accounts Receivable (in thousands)
|  | Balance at |  |  | Additions Charged to |  |  |  |  |  |  | Balance at |
Fiscal Year Ended |  | Beginning of Period |  |  | Costs and Expenses |  |  | Deductions |  |  | End of Period |
December 31, 2017 |  | $ | 42 |  |  | $ | 31 |  |  | $ | (27 | ) |  | $ | 46 |
December 31, 2016 |  | $ | 423 |  |  | $ | 3 |  |  | $ | (384 | ) |  | $ | 42 |
December 31, 2015 |  | $ | 166 |  |  | $ | 332 |  |  | $ | (75 | ) |  | $ | 423 |
Inventory Reserve (in thousands)
|  | Balance at |  |  |  |  |  |  |  | Balance at |
Fiscal Year Ended |  | Beginning of Period |  |  | Additions |  |  | Deductions |  |  | End of Period |
December 31, 2017 |  | $ | 3,594 |  |  |  | — |  |  | $ | (457 | ) |  | $ | 3,137 |
December 31, 2016 |  | $ | 4,020 |  |  |  | — |  |  | $ | (426 | ) |  | $ | 3,594 |
December 31, 2015 |  | $ | 2,995 |  |  | $ | 1,025 |  |  |  | — |  |  | $ | 4,020 |
See accompanying report of independent registered public accounting firm on page 41 of this annual report.

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- Definition The entire disclosure for any allowance and reserve accounts (their beginning and ending balances, as well as a reconciliation by type of activity during the period). Alternatively, disclosure of the required information may be within the footnotes to the financial statements or a supplemental schedule to the financial statements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -URI http://asc.fasb.org/topic&trid=2122369 + Details
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- References No definition available. + Details
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