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Selected Balance Sheet Information (Details 3) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Accrued bonus expense | $ 215 | $ 907
Accrued vacation expense | 124 | 118
Accrued severance | 2 | 307
Total | $ 341 | $ 1,332

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