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Income Taxes (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
May 31, 2019
May 31, 2018
May 31, 2019
May 31, 2018
Aug. 31, 2019
Aug. 31, 2018
Dec. 31, 2017
Income Taxes [Line Items]              
Federal statutory income tax rate           25.70% 35.00%
Income tax benefit $ (394) $ (554) $ (704) $ (4,927)      
Pre-tax loss $ (2,418) $ (3,088) $ (7,602) $ (12,593)      
Negative effective tax benefit rate affected by GILTI     9.30%        
GILTI tax expense     $ 300        
Scenario, Forecast [Member]              
Income Taxes [Line Items]              
Federal statutory income tax rate         21.00%