Leases (Narrative) (Details) $ in Thousands	1 Months Ended			3 Months Ended		6 Months Ended
	Mar. 31, 2026 USD ($)	Jan. 31, 2026 USD ($) item	Dec. 31, 2025 USD ($) ft²	Jun. 30, 2026 USD ($)	Jun. 30, 2025 USD ($)	Jun. 30, 2026 USD ($)	Jun. 30, 2025 USD ($)	Dec. 31, 2030 USD ($)	Dec. 31, 2029 USD ($)	Dec. 31, 2028 USD ($)	Dec. 31, 2027 USD ($)	Dec. 31, 2026 USD ($)	Mar. 17, 2026 USD ($) ft²	Sep. 30, 2025 USD ($) ft²	Jul. 31, 2025 USD ($) ft²	Nov. 30, 2024 item	Oct. 31, 2024 USD ($) ft²	Apr. 30, 2024 USD ($)	Aug. 21, 2021 USD ($) ft²
Lessee, Lease, Description [Line Items]
Asset impairment charge						$ 7,482
ROU asset impairment						7,400
Impairment of leasehold improvements						136
Lease liability				$ 27,127		27,127
Operating lease right-of-use assets			$ 17,488	15,236		15,236
Cash paid for amounts included in measurement of operating lease liabilities				1,600	$ 1,400	3,100	$ 2,800
Mountain View, California [Member]
Lessee, Lease, Description [Line Items]
Rentable area (in square feet) | ft²																			61,000
Letter of credit provided in place of security deposit	$ 800																		$ 4,300
Sublease, initial occupancy percentage	52.00%
Mountain View, California [Member] | Scenario, Plan [Member]
Lessee, Lease, Description [Line Items]
Sublease, annual base rent								$ 1,600	$ 2,400	$ 2,300	$ 1,100	$ 576
Santa Rosa, California [Member]
Lessee, Lease, Description [Line Items]
Rentable area (in square feet) | ft²																	4,000
Leases, initial term (in months)																	29 months
Security deposit																	$ 8
Lease liability																	169
Operating lease right-of-use assets																	$ 169
San Francisco, California [Member]
Lessee, Lease, Description [Line Items]
Rentable area (in square feet) | ft²													5,018		8,100
Leases, initial term (in months)													51 months		39 months
Security deposit													$ 62		$ 90
Lease liability													1,845		1,254
Operating lease right-of-use assets													$ 1,872		$ 1,254
Rohnert Park, California [Member]
Lessee, Lease, Description [Line Items]
Rentable area (in square feet) | ft²			13,100
Tenant improvement allowance			$ 173
Leases, initial term (in months)			63 months
Security deposit			$ 39
Lease liability			2,800
Operating lease right-of-use assets			2,800
Austin, Texas [Member]
Lessee, Lease, Description [Line Items]
Rentable area (in square feet) | ft²														26,000
Tenant improvement allowance		$ 71
Leases, initial term (in months)		51 months												12 months
Security deposit			$ 150	$ 150		$ 150
Lease liability		$ 2,500												$ 561
Operating lease right-of-use assets		$ 2,500												$ 561
Renewal term		3 years
Number of options | item		2
Tokyo, Japan [Member]
Lessee, Lease, Description [Line Items]
Lease liability																		$ 420
Operating lease right-of-use assets																		$ 420
Renewal term																		3 years
Number of contracts | item																1