Leases - Narrative (Details) $ in Millions	1 Months Ended										3 Months Ended		6 Months Ended
	May 31, 2026 USD ($) ft²	Jan. 31, 2026 USD ($) ft²	Dec. 31, 2025 USD ($) ft²	Aug. 31, 2025 USD ($) ft²	Mar. 31, 2025 USD ($) ft²	Jan. 31, 2025 USD ($) ft²	Sep. 30, 2023 USD ($) ft²	Dec. 31, 2021 lease	Nov. 30, 2020 USD ($) ft²	Oct. 31, 2016 ft² lease	Jun. 30, 2026 USD ($)	Jun. 30, 2025 USD ($)	Jun. 30, 2026 USD ($)	Jun. 30, 2025 USD ($)	Jul. 31, 2024	Jan. 31, 2023	Sep. 30, 2022 ft²	Feb. 28, 2022 ft²	Jan. 31, 2021	Sep. 30, 2015 ft²
Lessee, Lease, Description [Line Items]
Noncash operating activities related to right-of-use assets													$ 30.5	$ 14.3
Weighted average remaining lease term (in years)											7 years 7 days		7 years 7 days
Weighted average discount rate (as a percent)											6.60%		6.60%
Lease expense											$ 7.4	$ 5.0	$ 13.4	9.3
Operating lease payments													$ 12.0	$ 9.3
Laboratory and Office Spaces
Lessee, Lease, Description [Line Items]
Lease space (area) | ft²	19,652		15,485	45,800	57,100		16,319		11,395	136,000							65,222	32,500		94,000
Term of lease (in months)	5 years						60 months		36 months											132 months
Number of office space locations | lease								2		2
Annual lease payment	$ 0.5			$ 0.7	$ 0.9	$ 9.7	$ 0.9		$ 0.9
Renewal term of lease (in months)															60 months	3 years			48 months
Laboratory and Office Spaces | First Space San Carlos, California
Lessee, Lease, Description [Line Items]
Lease space (area) | ft²										88,000
Laboratory and Office Spaces | Second Space San Carlos, California
Lessee, Lease, Description [Line Items]
Lease space (area) | ft²										48,000
Laboratory and Office Spaces | Additional Space San Carlos, California
Lessee, Lease, Description [Line Items]
Lease space (area) | ft²		63,000				40,700
Term of lease (in months)		10 years
Annual lease payment		$ 4.4				$ 1.5
Laboratory and Office Spaces | Minimum
Lessee, Lease, Description [Line Items]
Term of lease (in months)											1 year		1 year
Laboratory and Office Spaces | Maximum
Lessee, Lease, Description [Line Items]
Term of lease (in months)											5 years		5 years
Austin, TX Additional Premises Lease
Lessee, Lease, Description [Line Items]
Lease space (area) | ft²			28,468
Annual lease payment			$ 0.4
Boulder, CO Lease
Lessee, Lease, Description [Line Items]
Lease space (area) | ft²			25,718
Annual lease payment			$ 1.5