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Leases - Additional Information (Detail) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |  |  |  |  |
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Mar. 31, 2026 USD ($) | Sep. 30, 2025 USD ($) Term | Sep. 30, 2024 USD ($) | Mar. 31, 2021 USD ($) | Sep. 30, 2025 USD ($) Term | Sep. 30, 2024 USD ($) | Dec. 31, 2023 USD ($) | May 31, 2025 USD ($) | Dec. 31, 2024 USD ($) | Sep. 30, 2020 USD ($) | Mar. 31, 2020 USD ($) | Feb. 29, 2020 USD ($) | Dec. 31, 2018 USD ($)
Lessee Lease Description [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Operating lease, description |  |  |  |  | The Company leases facilities and certain equipment under noncancelable operating leases with remaining lease terms of 0.3 years to 5.7 years, some of which include options to extend for up to two five-year terms. |  |  |  |  |  |  |  |
Operating lease, options to extend |  |  |  |  | some of which include options to extend for up to two five-year terms. |  |  |  |  |  |  |  |
Weighted average remaining lease term |  | 5 years 4 months 24 days |  |  | 5 years 4 months 24 days |  |  |  |  |  |  |  |
Weighted average discount rate |  | 4.90% |  |  | 4.90% |  |  |  |  |  |  |  |
Capitalization of lease liability |  |  |  | $ 19,200 |  |  |  |  |  | $ 40,300 |  |  |
Restricted cash |  | $ 9,471 | $ 8,770 |  | $ 9,471 | $ 8,770 | $ 5,770 |  | $ 8,770 |  |  |  |
Operating sublease income |  | $ 594 | $ 577 |  | $ 1,777 | $ 1,247 |  |  |  |  |  |  |
Corporate Office Space Lease Agreement |  |  |  |  |  |  |  |  |  |  |  |  |
Lessee Lease Description [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Operating leases arrangement term |  |  |  |  |  |  |  |  |  |  |  |  | 10 years 9 months
Corporate Office Space Lease Agreement | Letter of Credit |  |  |  |  |  |  |  |  |  |  |  |  |
Lessee Lease Description [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted cash |  |  |  | $ 3,100 |  |  |  |  |  |  |  |  |
California | Corporate Office Space Lease Agreement |  |  |  |  |  |  |  |  |  |  |  |  |
Lessee Lease Description [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum lease payment amount |  |  |  |  |  |  |  |  |  |  | $ 51,400 | $ 25,300 | $ 50,400
Operating leases arrangement term |  |  |  |  |  |  |  |  |  |  |  | 10 years 7 months |
Lease commencement period |  |  |  | first quarter of 2021 |  |  |  |  |  |  |  |  |
San Diego [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Lessee Lease Description [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Sublease Agreement Term |  |  |  |  |  |  | 7 years 6 months |  |  |  |  |  |
NEW JERSEY | Corporate Office Space Lease Agreement |  |  |  |  |  |  |  |  |  |  |  |  |
Lessee Lease Description [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum lease payment amount |  |  |  |  |  |  |  | $ 24,500 |  |  |  |  |
Operating leases arrangement term |  |  |  |  |  |  |  | 12 years 2 months |  |  |  |  |
Minimum |  |  |  |  |  |  |  |  |  |  |  |  |
Lessee Lease Description [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Operating lease remaining lease term |  | 3 months 18 days |  |  | 3 months 18 days |  |  |  |  |  |  |  |
Minimum | San Diego [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Lessee Lease Description [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Operating sublease income |  |  |  |  |  |  | $ 18,400 |  |  |  |  |  |
Maximum |  |  |  |  |  |  |  |  |  |  |  |  |
Lessee Lease Description [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Operating lease remaining lease term |  | 5 years 8 months 12 days |  |  | 5 years 8 months 12 days |  |  |  |  |  |  |  |
Number of renewal option terms | Term |  | 2 |  |  | 2 |  |  |  |  |  |  |  |
Operating lease, renewal term |  | 5 years |  |  | 5 years |  |  |  |  |  |  |  |
Subsequent Event [Member] | NEW JERSEY | Corporate Office Space Lease Agreement |  |  |  |  |  |  |  |  |  |  |  |  |
Lessee Lease Description [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Lease commencement period | first quarter of 2026 |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Member] | NEW JERSEY | Corporate Office Space Lease Agreement | Letter of Credit |  |  |  |  |  |  |  |  |  |  |  |  |
Lessee Lease Description [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted cash | $ 600 |  |  |  |  |  |  |  |  |  |  |  |

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