Leases (Details) $ in Thousands	1 Months Ended		3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2023 USD ($) ft²	Sep. 30, 2021 USD ($) ft²	Sep. 30, 2024 USD ($) ft²	Sep. 30, 2023 USD ($) ft²	Sep. 30, 2024 USD ($) ft² lease item	Sep. 30, 2023 USD ($) ft²	Dec. 31, 2025 USD ($)	Jul. 31, 2024	Dec. 31, 2023 USD ($)
Lessee, Lease, Description [Line Items]
Operating lease liabilities, current portion included in other accrued liabilities			$ 9,762		$ 9,762				$ 11,621
Operating lease liabilities, long-term portion			98,953		98,953				67,025
Operating lease liabilities			$ 108,715		108,715				$ 78,646
Noncash operating activities related to right-of-use assets					$ 38,200	$ 100
Weighted average remaining lease term			8 years 7 days		8 years 7 days
Weighted average discount rate (as a percent)			7.20%		7.20%
Lease expense			$ 4,000	$ 3,600	$ 11,200	11,000
Operating lease payments			$ 4,200	$ 3,200	$ 12,500	$ 8,400
Austin TX, Long-term Lease
Lessee, Lease, Description [Line Items]
Lease space (area) | ft²			94,000		94,000
Number of office space locations | lease					2
Term of lease			132 months		132 months
First Expansion Premises
Lessee, Lease, Description [Line Items]
Lease space (area) | ft²			32,500		32,500
Second Expansion Premises
Lessee, Lease, Description [Line Items]
Lease space (area) | ft²			65,222		65,222
Corporate Headquarters Lease
Lessee, Lease, Description [Line Items]
Lease space (area) | ft²			136,000		136,000
Number of office space locations | item					2
"First Space" Sublease
Lessee, Lease, Description [Line Items]
Number of office space locations | ft²					88,000
"Second Space" Sublease
Lessee, Lease, Description [Line Items]
Number of office space locations | ft²					48,000
Corporate Headquarters Lease Amendment
Lessee, Lease, Description [Line Items]
Annual lease payment							$ 9,300
Term of lease			48 months		48 months
Tukwila, WA Lease
Lessee, Lease, Description [Line Items]
Lease space (area) | ft²			10,000		10,000
Term of lease			62 months		62 months
Renewal term of lease			5 years		5 years
San Carlos, CA Sublease Amendment
Lessee, Lease, Description [Line Items]
Renewal term of lease								60 months
San Carlos, CA Sublease Amendment | Forecast
Lessee, Lease, Description [Line Items]
Annual lease payment							$ 9,700
South San Francisco, CA Lease
Lessee, Lease, Description [Line Items]
Lease space (area) | ft²			11,395		11,395
Annual lease payment					$ 900
Term of lease			36 months		36 months
Renewal term of lease			3 years		3 years
Pleasanton, CA Lease
Lessee, Lease, Description [Line Items]
Lease space (area) | ft²	16,319			16,319		16,319
Annual lease payment	$ 500
Term of lease	60 months			60 months		60 months
Laboratory space in Canada
Lessee, Lease, Description [Line Items]
Lease space (area) | ft²		7,107
Annual lease payment		$ 200
Term of lease		24 months
Certain workspaces and storage spaces | Minimum
Lessee, Lease, Description [Line Items]
Term of lease			1 year		1 year
Certain workspaces and storage spaces | Maximum
Lessee, Lease, Description [Line Items]
Term of lease			5 years		5 years