Leases - Additional Information (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022 USD ($) ft²	Sep. 30, 2021 USD ($)	Sep. 30, 2022 USD ($) ft²	Sep. 30, 2021 USD ($)	Dec. 31, 2021 USD ($)
Leases [Line Items]
Lessee, finance lease, lease not yet commenced, description			The Company does not currently have any finance leases or executed leases that have not yet commenced.
Operating lease, rent expense, net	$ 200	$ 200	$ 600	$ 400
Operating lease, weighted-average remaining lease term	5 years 3 months 18 days		5 years 3 months 18 days
Operating lease, weighted-average discount rate	7.10%		7.10%
Carrying amount of lease receivables	$ 3,500		$ 3,500
Unguaranteed residual assets	0		0
Operating lease income	70	30	200	200
Property and equipment, net	$ 2,109		$ 2,109		$ 1,220
NeuroStar Advanced Therapy Systems | Minimum
Leases [Line Items]
Lessor sales-type lease, Term	3 years		3 years
NeuroStar Advanced Therapy Systems | Maximum
Leases [Line Items]
Lessor sales-type lease, Term	4 years		4 years
Headquarters and Office Equipment, Including Copiers
Leases [Line Items]
Area of lease facility | ft²	32,000		32,000
Rental Equipment
Leases [Line Items]
Property and equipment, net	$ 500		$ 500		$ 600
Rental equipment depreciation expense	$ 20	$ 10	$ 70	$ 30
Charlotte, North Carolina
Leases [Line Items]
Area of lease facility | ft²	9,600		9,600