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Accrued Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | --- | ---
Payables and Accruals [Abstract] |  |  |
Accrued payroll and related benefits | $ 435 | $ 394 |
Accrued sales commissions and incentives | 115 | 124 |
Accrued warranty expense | 258 | 174 | $ 331
Accrued severance and related benefits | 188 | 0 |
Accrued restructuring - short-term | 156 | 170 |
Accrued legal and professional fees | 160 | 77 |
Accrued other expenses | 73 | 53 |
Total accrued liabilities | $ 1,385 | $ 992 |

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