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Schedule II - Schedule of Valuation and Qualifying Accounts (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Allowance for doubtful accounts and returns |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Beginning Balance | $ 42 | $ 236 | $ 155
Charges to Revenue/ Expense | 20 | 23 | 156
Deductions | 29 | 217 | 75
Ending Balance | 33 | 42 | 236
Reserve for excess, obsolete, and slow moving inventories |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Beginning Balance | 4,196 | 5,596 | 2,315
Charges to Revenue/ Expense | 1,085 | 1,139 | 6,110
Deductions | 1,069 | 2,539 | 2,829
Ending Balance | 4,212 | 4,196 | 5,596
Valuation allowance for deferred tax assets |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Beginning Balance | 10,556 | 12,537 | 7,768
Charges to Revenue/ Expense | 2,187 | 3,883 | 4,769
Deductions | 0 | 5,864 | 0
Ending Balance | $ 12,743 | $ 10,556 | $ 12,537

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- Definition Amount of valuation and qualifying accounts and reserves. + References Reference 1: 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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