Supplemental Balance Sheet Disclosures - Deferred Revenue (Details) $ in Thousands	9 Months Ended		12 Months Ended
	Sep. 30, 2022 USD ($) item	Sep. 30, 2021 USD ($) item	Dec. 31, 2021 USD ($) item
Deferred Revenue
Amount of license fees not yet recognized under the Co-Promotion Agreement, included in deferred revenue	$ 200		$ 200
Amount of deferred revenue related to the fair value of the remaining poNS devices to be transferred that had been included as consideration in the Company's acquisition of Heuro			$ 100
Number of devices recorded as deferred revenue | item			16
Amount of deferred revenue recognized related to Product Sales	$ 100	$ 30
Number Of Devices Resulted In Recognition Of Revenue | item	16	4