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Valuation and Qualifying Accounts | 12 Months Ended
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Dec. 31, 2018
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, 2018 |  | $ | 46 |  |  | $ | 1,217 |  |  | $ | — |  |  | $ | 1,263 |
December 31, 2017 |  | $ | 42 |  |  | $ | 31 |  |  | $ | (27 | ) |  | $ | 46 |
December 31, 2016 |  | $ | 423 |  |  | $ | 3 |  |  | $ | (384 | ) |  | $ | 42 |
Inventory Reserve (in thousands)
|  | Balance at |  |  |  |  |  |  |  | Balance at |
Fiscal Year Ended |  | Beginning of Period |  |  | Additions |  |  | Deductions |  |  | End of Period |
December 31, 2018 |  | $ | 3,137 |  |  |  | 476 |  |  | $ | (1,624 | ) |  | $ | 1,989 |
December 31, 2017 |  | $ | 3,594 |  |  |  | — |  |  | $ | (457 | ) |  | $ | 3,137 |
December 31, 2016 |  | $ | 4,020 |  |  |  | — |  |  | $ | (426 | ) |  | $ | 3,594 |
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 valuation and qualifying accounts and reserves. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 12 -Subsection 09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -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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- References No definition available. + Details
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