Leases (Details) $ in Thousands	1 Months Ended					3 Months Ended		9 Months Ended
	Aug. 31, 2025 USD ($) ft²	Mar. 31, 2025 USD ($) ft²	Jan. 31, 2025 USD ($) ft²	Oct. 31, 2023 USD ($)	Sep. 30, 2023 USD ($) ft²	Sep. 30, 2025 USD ($) ft²	Sep. 30, 2024 USD ($)	Sep. 30, 2025 USD ($) ft² item lease	Sep. 30, 2024 USD ($)	Dec. 31, 2024 USD ($)	Jul. 31, 2024
Lessee, Lease, Description [Line Items]
Operating lease liabilities, current portion included in other accrued liabilities						$ 14,006		$ 14,006		$ 10,168
Operating lease liabilities, long-term portion						104,380		104,380		96,588
Operating lease liabilities						$ 118,386		118,386		$ 106,756
Noncash operating activities related to right-of-use assets								$ 19,800	$ 38,200
Weighted average remaining lease term						6 years 10 months 9 days		6 years 10 months 9 days
Weighted average discount rate (as a percent)						7.00%		7.00%
Lease expense						$ 5,500	$ 4,000	$ 14,800	11,200
Operating lease payments						$ 4,900	$ 4,200	$ 14,200	$ 12,500
Austin TX, Long-term Lease
Lessee, Lease, Description [Line Items]
Lease space (area) | ft²		57,100				94,000		94,000
Number of office space locations | lease								2
Annual lease payment		$ 900
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
Austin, TX Additional Premises Lease
Lessee, Lease, Description [Line Items]
Lease space (area) | ft²	45,800
Annual lease payment	$ 700
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
San Carlos, CA Sublease Amendment
Lessee, Lease, Description [Line Items]
Annual lease payment			$ 9,700
Renewal term of lease											60 months
Additional premises San Carlos, CA lease
Lessee, Lease, Description [Line Items]
Lease space (area) | ft²			40,700
Annual lease payment			$ 1,500
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
Annual lease payment					$ 500
Term of lease					60 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