Commitments and Contingencies - Additional Information (Details)	1 Months Ended				3 Months Ended		9 Months Ended		12 Months Ended
	Jan. 31, 2022	Apr. 30, 2021	Jan. 31, 2021 USD ($) ft²	Aug. 31, 2018 ft² Lease $ / ft²	Sep. 30, 2022 USD ($) $ / ft²	Sep. 30, 2021 USD ($)	Sep. 30, 2022 USD ($) $ / ft²	Sep. 30, 2021 USD ($)	Dec. 31, 2018 USD ($)	Jun. 30, 2017 ft² $ / ft²	Jun. 30, 2015 ft² $ / ft²
Commitments And Contingencies Disclosure [Line Items]
Number of noncancelable operating leases | Lease				2
Rent expense					$ 578,000	$ 511,000	$ 1,619,000	$ 1,180,000
Cranbury, New Jersey
Commitments And Contingencies Disclosure [Line Items]
Area of operating lease property | ft²										6,000	13,000
Initial base rent per square foot | $ / ft²										22.00	20.00
Operating lease expiration period							2022-06
Operating lease, existence of option to terminate [true false]	true
Operating lease, option to terminate	In January 2022, the Company signed a lease extension for both leases for up to one additional year with the option to terminate upon 120 days of written notice, with an increase in base rent as per the lease extension.
Operating lease maintenance expense per square foot | $ / ft²					3.00		3.00
Operating lease, description							Both leases include a common area maintenance expense for $3.00 per square foot with an increase of 3% on the first month of each calendar year during the lease term and a management fee of 3% of the base rent.
Management fee of base rent percentage					3.00%		3.00%
Cranbury, New Jersey | Maximum
Commitments And Contingencies Disclosure [Line Items]
Operating lease, renewal term	1 year
South Brunswick, New Jersey.
Commitments And Contingencies Disclosure [Line Items]
Area of operating lease property | ft²				6,000
Initial base rent per square foot | $ / ft²				15.50
Operating lease expiration period				2022-07
Operating lease, existence of option to terminate [true false]	true
Operating lease, option to terminate	In January 2022, the Company signed a lease extension for up to one additional year with the option to terminate upon 120 days of written notice, with an increase in base rent as per the lease extension.
Management fee of base rent percentage				3.00%
South Brunswick, New Jersey. | Maximum
Commitments And Contingencies Disclosure [Line Items]
Operating lease, renewal term	1 year
Lexington, Massachusetts
Commitments And Contingencies Disclosure [Line Items]
Initial base rent per square foot | $ / ft²				28.50
Operating lease expiration period				2023-08
Operating lease, renewal term				3 years
Initial base rent increased per square foot | $ / ft²				1.00
Allowance on behalf of lessor for construction of office space.									$ 165,000
Remaining rent incentives					$ 35,000		$ 35,000
Sublease expiration period							2023-08
Princeton, New Jersey
Commitments And Contingencies Disclosure [Line Items]
Operating lease, description							That lease term extends through 2032, has a five-year extension option, and is intended to replace the Company’s two existing facilities and the space is expected to become the Company’s future headquarters
Lease area of square feet | ft²			50,581
Operating Leases, extended year			2032
Operating leases, extension period			5 years
Operating lease, payments			$ 19,889,000
Operating leases extended month and year			2032-05
Tenant improvement allowance			$ 4,046,000
Reimbursements received					1,612,000		$ 1,612,000
Sublease with tenant office space starting period		2021-04
Sublease with tenant office space ending period		2021-06
Sublease income					$ 29,000	$ 29,000	$ 83,000	$ 89,000