Leases - Components of Lease Assets and Liabilities (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Dec. 31, 2022	Sep. 30, 2022
Lease Assets and Liabilities
Right-of-use assets	$ 41,655	$ 58,291
Lease liabilities	2,664	2,776
Lease liabilities, net of current portion	79,470	78,800
Lease Cost
Total	2,812	1,456
Research and development
Lease Cost
Operating lease cost	2,069	878
Variable lease cost	210	158
General and administrative expense
Lease Cost
Operating lease cost	533	420
Variable lease cost	$ 0	$ 0