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Schedule II -Valuation and Qualifying Accounts (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Balance at Beginning of Period | $ 530 |  |
Balance at End of Period | 831 | $ 530 |
Reserve for Uncollectible Accounts Receivable and Sales Return [Member] |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Balance at Beginning of Period | 530 | 596 | $ 387
Charged to Costs and Expenses | 600 | 215 | 282
Deductions | (300) | (286) | (61)
Other | 1 | 5 | (12)
Balance at End of Period | 831 | 530 | 596
Sales Returns and Allowances [Member] |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Balance at Beginning of Period | 1,291 | 1,050 | 1,181
Charged to Costs and Expenses | 0 | 225 | 182
Deductions | 0 | 0 | (282)
Other | 0 | 16 | (31)
Balance at End of Period | 1,291 | 1,291 | 1,050
Deferred Tax Valuation Allowance [Member] |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Balance at Beginning of Period | 7,312 | 6,112 | 5,309
Charged to Costs and Expenses | 1,256 | 1,200 | 803
Deductions | 0 | 0 | 0
Other | 0 | 0 | 0
Balance at End of Period | $ 8,568 | $ 7,312 | $ 6,112

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- Definition Amount of increase (decrease) in valuation and qualifying accounts and reserves from adjustment. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -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=120395691&loc=d3e24092-122690 + Details
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