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Selected Balance Sheet Information (Details 3) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Accrued bonus expense | $ 1,007 | $ 1,283
Accrued vacation expense | 289 | 201
Accrued severance | 138 | 590
Total | $ 1,434 | $ 2,074

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