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Contingency (Details) - USD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2019 | Mar. 28, 2018
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 | $ 60 |  |  | $ 1,163
Sales tax contingent liabilities |  | $ 96 | $ 150 |
Sales tax examination, payments | 15 | $ 50 |  |
Sales tax examination, interest | 5 |  |  |
Sales tax examination, reversed expense | $ 181 |  |  |

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