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Accrued Expenses and Other Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Sep. 30, 2018
Mar. 31, 2018
Sep. 30, 2017
Payables and Accruals [Abstract]        
Compensation and benefits $ 3,296 $ 2,500   $ 1,662
Research and development costs 9,362 6,659   339
UCLB milestone 638 653 $ 500 0
Professional fees 4,130 3,099   300
Deferred rent 561 569   197
Other liabilities 1,067 623   589
Total accrued expenses and other liabilities 19,054 14,103   3,087
Taxes payable 600      
Current portion of long term debt and leases $ 400 $ 400   $ 400