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Accrued Expenses and Other Liabilities (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2018
Mar. 31, 2018
Sep. 30, 2017
Payables and Accruals [Abstract]      
Compensation and benefits $ 2,500   $ 1,662
Research and development costs 6,659   339
UCLB milestone 653 $ 500 0
Professional fees 3,099   300
Deferred rent 569   197
Other liabilities 623   589
Total accrued expenses and other liabilities 14,103   3,087
Current portion of long term debt and leases 400   $ 400
Increase in accrued research and development cost 6,300    
Increase in accrued professional service fees $ 2,800