Leases (Narrative) (Details) $ in Thousands	Feb. 11, 2021 USD ($) ft² contract	Sep. 30, 2021 USD ($)	Apr. 30, 2021 USD ($)	Dec. 31, 2020 USD ($)	Jul. 01, 2019 USD ($)	Jun. 19, 2019 USD ($) ft²
Lessee, Lease, Description [Line Items]
Remaining liability to be paid		$ 185
Base rent payments due 2021		754
ROU asset		2,690		$ 253
Operating lease payments due		$ 3,616
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