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Schedule II - 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 Bad Debts [Member] |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Balance at beginning of period | $ 2,137 | $ 2,031 | $ 1,336
Charged to costs and expenses | 1,485 | 1,031 | 983
Deductions | (962) | (925) | (288)
Balance at end of period | 2,660 | 2,137 | 2,031
Sales Returns and Allowances [Member] |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Balance at beginning of period | 2,219 | 1,817 | 1,814
Charged to costs and expenses | 1,050 | 424 | 268
Deductions | (23) | (22) | (265)
Balance at end of period | 3,246 | 2,219 | 1,817
Deferred Tax Asset Valuation Allowance [Member] |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Balance at beginning of period | 570 | 441 | 124
Charged to costs and expenses | 589 | 129 | 317
Deductions | 0 | 0 | 0
Balance at end of period | $ 1,159 | $ 570 | $ 441

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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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- Definition Amount of decrease in 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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