Commitments and Contingencies (Narrative) (Details) - USD ($)	1 Months Ended
	Apr. 30, 2020	Jun. 30, 2021	Dec. 31, 2020
Commitments and Contingencies
Operating lease base rent	$ 1,900,000
Annual increase in rent percentage	3.00%
Base rent at the end of lease term	$ 2,500,000
Lease and rental abatement credit	800,000
Operating Lease, Liability	11,700,000
Operating Lease, Right-of-Use Asset	$ 11,000,000.0	$ 10,614,000	$ 10,790,000
Lessee, Operating Lease, Discount Rate	12.89%