Controlled Launch (Narrative) (Details) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022 USD ($)	Jun. 30, 2021 USD ($)	Jun. 30, 2022 USD ($) item	Jun. 30, 2021 USD ($)
Controlled Launch [Abstract]
Number of KOLs | item			70
Number of patients participating in procedure			40 or 50
Program expenses	$ 0.1	$ 0.4	$ 0.6	$ 0.6
Revenue recognized	$ 0.1		$ 0.4