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Income Taxes - Reconciliation of the federal statutory rate (Details)
12 Months Ended
Dec. 22, 2017
Dec. 21, 2017
Sep. 30, 2019
Sep. 30, 2018
Income Taxes        
Federal statutory rate 21.00% 35.00% 21.00% 24.28%
State rate, net of federal benefit     (36.16%) (9.29%)
Permanent differences     (45.18%)  
Change in valuation allowance     (66.33%)  
Foreign rate differential and other     27.80%  
Federal impact under TCJA     34.29%  
Tax credits generated in foreign jurisdictions     60.23%  
Non-deductible related de-registration costs     (82.62%)  
Effective tax rate     (86.97%) 8703.64%