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Accrued Expenses (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Schedule of accrued expenses |  |
Accrued returns and warranty | $ 17 | $ 35
Accrued consulting fees and other | 248 | 142
Total accrued expenses | $ 265 | $ 177

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