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Leases - Components of Lease Assets and Liabilities (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Mar. 31, 2023	Mar. 31, 2022	Sep. 30, 2022
Lease Assets and Liabilities
Right-of-use assets	$ 41,114		$ 41,114		$ 58,291
Lease liabilities	2,711		2,711		2,776
Lease liabilities, net of current portion	80,070		80,070		$ 78,800
Lease Cost
Total	3,003	$ 1,507	5,815	$ 2,963
Research and development
Lease Cost
Operating lease cost	2,343	905	4,412	1,783
Variable lease cost	160	182	370	340
General and administrative expense
Lease Cost
Operating lease cost	500	420	1,033	840
Variable lease cost	$ 0	$ 0	$ 0	$ 0

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Amount of lease cost recognized by lessee for lease contract.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 50
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Amount of single lease cost, calculated by allocation of remaining cost of lease over remaining lease term. Includes, but is not limited to, single lease cost, after impairment of right-of-use asset, calculated by amortization of remaining right-of-use asset and accretion of lease liability.

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Present value of lessee's discounted obligation for lease payments from operating lease, classified as current.

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Present value of lessee's discounted obligation for lease payments from operating lease, classified as noncurrent.

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Amount of lessee's right to use underlying asset under operating lease.

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Amount of variable lease cost, excluded from lease liability, recognized when obligation for payment is incurred for finance and operating leases.

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