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Contingencies (Details) - USD ($) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2020 | Mar. 31, 2019 | Dec. 31, 2019
Commitments and Contingencies Disclosure [Abstract] |  |  |
Non-conformance accrual | $ 146,000 |  | $ 146,000
Change in warranty liability balance | 0 | $ 0 |
Warranty liability balance | $ 159,000 | $ 159,000 |

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