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Contingency (Detail) - USD ($) $ in Thousands | Dec. 31, 2018 | Mar. 28, 2018
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Commitments and Contingencies Disclosure [Abstract] |  |
Sales tax examination excluding penalties and interest accrued |  | $ 824
Sales tax examination penalties and interest accrued |  | 339
Sales tax examination liability refund adjustment from settlement with tax authority |  | $ 1,163
Sales tax contingent liabilities | $ 96 |

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- Definition Sales tax contingent liabilities. + References No definition available. + Details
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