Leases (Narrative) (Details) $ in Thousands	Feb. 11, 2021 USD ($) ft² contract	Mar. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Mar. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Apr. 30, 2021 USD ($)	Dec. 31, 2020 USD ($)	Jul. 01, 2019 USD ($)	Jun. 19, 2019 ft²
Lessee, Lease, Description [Line Items]
Remaining liability to be paid		$ 586
Base rent payments due 2021		800
ROU asset		1,902	$ 2,039
Operating lease payments due		2,487
Restricted cash		62	62	$ 62
Prior Premises
Lessee, Lease, Description [Line Items]
Net rentable area | ft²									8,727
Term of contract					2 years 6 months
Remaining liability to be paid							$ 400
Base rent payments due 2021					$ 400
Initial direct cost liability								$ 800
ROU asset								600
Deferred credit, operating lease liabilities								$ 200
Campus Point Lease
Lessee, Lease, Description [Line Items]
Term of contract	60 months
Initial direct cost liability	$ 3,200					$ 100
ROU asset	3,000					100
Deferred credit, operating lease liabilities	$ 200
Rented area | ft²	13,438
Operating lease payments due	$ 3,800
Nonrefundable lease cost for assignment	$ 60
Number of operating lease contracts | contract	3
Deferred cost of liability						$ 200
Restricted cash		$ 62	$ 62